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Question 150851: Sulfuric acid (H2SO4) can be used to remove water from organic materials leaving behind a residue of black carbon. If beaker A contains a 15% solution of sulfuric acid and beaker B contains a 20% solution of sulfuric acid, how much from each beaker should be used to make 6 liters of a 18% solution of sulfuric acid?

Click here to see answer by stanbon(75887)

Question 151050: I dont understand this question can anyone explain it to me?
2. (5 pts)
Construct a frequency distribution of the ages that 25 randomly selected smokers started smoking: Simply listing every age as a separate class is not correct as 11 classes is too many for this data set! consrtuct a histogram and a frequency polopygon.
26 26 25 17 16 16 14 17 21 16
16 18 17 15 15 19 16 17 22 15
19 17 16 27 16

Click here to see answer by vleith(2983)

Question 151089: I really need help figuring this problem out can anyone please help?
Find the mean, median, and mode for the following set of data which shows the number of pages per article in a random sample of magazine articles.
4 6 4 6 5 4 4 5
7 4 3 6 5 8 4

Click here to see answer by Fombitz(32388)

Question 151255: I am having difficulty with this word problems, I am not sure where to begin.
If Steve can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, Jack can mix 20 drinks in 15 minutes, how much tie will it take if all 3 of them work together to mix 20 drinks?
The study guide lists the answer as 2 minutes, 44 seconds
Click here to see answer by ankor@dixie-net.com(22740)

Question 151309: There is a collection of snakes and iguanas. The reptiles have a total of 50 eyes and 56 feet. How many reptiles of each type do you have?
Click here to see answer by Earlsdon(6294)

Question 151483: Please help me my friends all have the same answer but I don't.
7.)How many quarts of a 60% alcohol solution must be added to 40 quarts of a 20% alcohol solution to obtain a mixture whic is 30% alcohol? All percentages are by volume.
6.) What weight of water must be evaporated from 40lb of a 20% salt solution to produce a 50% solution? All percentages are by weight.
thank you
Click here to see answer by checkley77(12844)

Question 151641: A 4% salt solution is mixed with a 16% salt solution. How many milliliters of each solution are needed to obtain 600 millilters of a 10% solution?
Click here to see answer by nerdybill(7384)

Question 151779: Hello, please explain to me how I should set up a system of equations to solve this problem. How many liters of a 30% acid solution must be added to a 10% acid solution to obtain 32 liters of a 15% acid solution?
Click here to see answer by vleith(2983)

Question 152196: A wire is 10 meters long is divided into 3 parts, one of which is 2 meters longer than the first and the third is 2 times longer than the second. Find the length of each part?
Click here to see answer by edjones(8007)

Question 152197: A rope is 75 ft. long and is cut into 2 pieces where one is 11 ft. long than other. Find their lengths.
Click here to see answer by orca(409)

Question 152357: Word Problems are so hard for me. I can do them with a calulator, but to write them out in algebriac terms and answering them, I am at a loss.
Here is the word problem:
Samantha needs 20 quarts of 50% antifreeze solution in her radiator. She plans to obtain this by nixing some pure antifreeze with an appropriate amount of 40% antifreeze solution. How many quarts of each should she use?
I was thinking 40x . 50 = 20 or maybe 50x + (40 x 20)
I am so new at math, and it is just confusing me to no end!I don't know how to write it, but normally if it's written out I can answer the problem if it's not too complicated.
I would really appreciate any help on this.
Click here to see answer by Earlsdon(6294)

Question 152465: How many pints of a 9% cleaning solution must be mixed with 10 pints of a 13%
cleaning solution to give a 11% solution?
Click here to see answer by ptaylor(2198)

Question 152449: Hydrochloric acid and distilled water were mixed to produce 210 mL of solution.
If 120 mL more H20 was used tahn HCl, how many milliliters of each were mixed?
Click here to see answer by jojo14344(1513)

Question 152908: The rate of motorcycle is 40 mph greater than the rate of a bicycle. The motorcycle travels 150 miles in the same amount of time as the bicycle travels 30 miles. Find the rate of the motocycle.

two people working together can do a job in 3 hrs. How long will it take the slower person to do the same job if one of them is 3 times as fast as the other?

Click here to see answer by mangopeeler07(462)

Question 152827: Please Help! I am not sure how to put this into an equations
Address the following Hardy-Weinberg Equilibrium problem.
1)A population of iguanas on the Galapagos Islands has 20 individuals with webbed feet and 180 individuals with the dominant trait of non-webbed feet. What are the frequencies of webbed feet and non-webbed feet traits in this population?
2)How is the dominant allele frequency calculated from this population?
3)Calculate the genotype frequencies: p2 -the frequency of the dominant homozygotes; 2pq �the frequency of heterozygotes; and q2 �the frequency of the recessive homozygotes (hint: insert the values calculated for p and q such that p2+2pq+q2=1.0). Explain why p2 and q2 represent the proportion of dominant and recessive homozygotes, respectively, and why 2pq represents the proportion of heterozygotes (hint: consider the law of independent assortment and the laws of probability).
4)Is the population in Hardy-Weinberg Equilibrium? Why or why not?

Click here to see answer by mducky2(62)

Question 153066: Hi iam having some problems with this question, i would appreciate it very much if you could solve it for me, thank you.
Equalizing cost.
United products co. manufactures calculators and has plants in the cities of Exton AND WHYTON .At the Exton plant, fixed cost are $7000 per month , and cost of producing each calculator is $7.50.At the Whyton plant ,fixed cost are $8800 per month ,and each calculator costs $6.00 to produce .Next month ,United products must produce 1500 calculators.How many must be made at each plant if the total cost at each plant is be the same

Click here to see answer by checkley77(12844)

Question 153532: How many liters of a 20% alcohol solution must be added to 80 liters of a 50% alcohol solution to form a 45% solution?
Also,
How many pounds of coffee A at $3/pound should be mixed with 2.5 pounds of coffee B at $4.20/pound to form a mixture selling for $3.75/pound?
Click here to see answer by stanbon(75887)

Question 153543: How many kilograms of water must be evaporated from 50 kg of a 10% salt solution to obtain a 15% salt solution?
Click here to see answer by stanbon(75887)

Question 153543: How many kilograms of water must be evaporated from 50 kg of a 10% salt solution to obtain a 15% salt solution?
Click here to see answer by ankor@dixie-net.com(22740)

Question 153669: yearly profits
In news report ,profits of acompany this year(T) are often compared with those of last year (L),but actual values of of T and L are not always given.This year , a company had profits of $25 million more than last year.The profits were up 30%.Determine T and L from these data.

this is my model of the question please, advise me on my mistake if there is any,thank you
T+25 + L= 30%(T+25 + L)+T+25 + L
Click here to see answer by scott8148(6628)

Question 153668: yearly profits
In news report ,profits of acompany this year(T) are often compared with those of last year (L),but actual values of of T and L are not always given.This year , a company had profits of $25 million more than last year.The profits were up 30%.Determine T and L from these data.

this is my model of the question please, advise me on my mistake if there is any,thank you
T+25 + L= 30%(T+25 + L)+T+25 + L
Click here to see answer by scott8148(6628)

Question 153667: commision

A company pays its salespersons on a basis of a certain percentage of the first $100,000 in sales plus a certain percentage of any amount over $100,000 in sales.If one salesperson earned $8500 on sales of $175000 and another salesperson earned $14800 on sales of $280,000 find the two percentages
model:1 175000x + 100,0000- x=8500
Can you please advise me how to construct models of worded questions. I am not sure what i should do with the $8500 AND the $175000 in this problem, however i know that commission is an percentage of the amount sales
Click here to see answer by scott8148(6628)

Question 153665: commision

A company pays its salespersons on a basis of a certain percentage of the first $100,000 in sales plus a certain percentage of any amount over $100,000 in sales.If one salesperson earned $8500 on sales of $175000 and another salesperson earned $14800 on sales of $280,000 find the two percentages
model:1 175000x + 100,0000- x=8500
Can you please advise me how to construct models of worded questions. I am not sure what i should do with the $8500 AND the $175000 in this problem, however i know that commission is an percentage of the amount sales
Click here to see answer by scott8148(6628)

Question 153899: concrete mix
A builder makes a certain type of concrete by mixing together 1 part portland cement (made from line and clay),3 parts sand ,and 5 parts crushed stone(by volume).If 765 ft^3 of concrete are needed ,how many cubic feet of each ingredient does he need?
iam trying to learn how to master worded problems, but i am faced with a lot of obstacles.However i would appreciate it very much if you could help me solve this problem.Thank you
Click here to see answer by dolly(163)

Question 153900: ventillating duct
The diameter of a circular ventilating duct is 140mm.This is joined to a square duct system .To ensure smooth airflow,the area of the circle and square sections must be equal.To the nearest millimeter,what should the length x of a side of the square section be?
my model :area of circle = ares of square
3.14*70^2=x^2
I know that this problems should be in a quadratic form,but i am having trouble with this one
Can you help me with this problem please.Thank you very much
Click here to see answer by dolly(163)

Question 153898: Gypsy Moth
one of the most troublesome defoliating insect is the gypsy moth caterpillar, which feeds on foliage of shade,forest and ,and fruit trees.A homeowner lives in an area in which the gypsy moth has become a problem.She wishes to spray the tree on her property before more defoliation occurs.She needs 1280z of a solution made up of 3 parts of insecticide A and 5 parts of insecticide B. The solution is then mixed with water.How many ounces of each insecticide should be used?
Iam having some problems constructing this model,i would appreciate it very much if you could guide me through this problem.thank you
Click here to see answer by dolly(163)

Question 153934: a machine company has an incentive plan for its salesperson.For each machine that a salesperson sell,the commission is $40.The commission for every machine sold will increase by $0.04 for each machine sold over 600.For example the commission on each 602 machine sold is $40.08. How many machines must salesperson sell in order to earn $30,800 ?
I already work this problem but i want to see how a professional would approach the this question. Thank you

Click here to see answer by stanbon(75887)

Question 154118: The radiator in a car is filled with a solution of 80% antifreeze and 20% water. The manufacturer of the antifreeze suggests that, for summer driving, optimal cooling of the engine is obtained with only 40% antifreeze. If the capacity of the radiator is 3.8 L, how much coolant should be drained and replaced with water to reduce the antifreeze concentration to the recommended level?

Click here to see answer by ptaylor(2198)

Question 154167: A liter of fluid is 50% alcohol. How much water must be added to dilute it to a 20% solution?

my work: so x is the amount of water to be added.
so something + x should = .20??
Click here to see answer by orca(409)

Question 154154: #41
Real estate
A land investment company purchased a parcel of land for $7200.After having sold all but 20 acres at a profit of $30 per acre over the original cost per acres, the company regained the entire cost of the parcel .How many acres were sold ?
#42
Margin of profit
The margin of profit of a company is the net income divided by the total sales. A company�s margin of profit increasing by 0.02 from last year. Last year the company sold its product at $3.00 each and had a net income of $4500.This year increasing the price of its product by $0.50 each, sold 2000 more, and had a net income of $7140.The company never has had a margin of profit greater than 0.15.How many of its product were sold last year and how many were sold this year?
i am working on these problems, i just need some clarification in regards to answers ,and the proper approach to solve them.thank you
Click here to see answer by stanbon(75887)

Question 154183: How much water must be evaporated from 38 ounces of a 4% salt solution to make a 5% salt solution?
I have to "let x = something"
and then set up an equation and solve it.
Click here to see answer by stanbon(75887)

Question 153570: A cake recipe serves 3 people, and calls for 1.25 cups of flour and 2 cups of sugar. I have 3.25 cups of flour, and 8.75 cups of sugar. If I use the recipe to bake the largest cake possible with these ingredients, how many people will it serve?
Please help me.
Thank you so much
Click here to see answer by jojo14344(1513)

Question 154253: A chemist is making a solution that is to be 55% chlorine. He has one solution that is 40% chlorine and another that is 65% chlorine. He wants 100 liters of the final solution. How much of each should he mix?
a. Choose a variable to represent the amount of the first solution. Then find the amount of the second solution to be added to make 100 liters. Now figure out how much chlorine is in each solution.
b. Write the equation.
c. Solve the equation
Click here to see answer by checkley77(12844)

Question 154271: The radiator in a car is filled with a solution of 60%antifreeze and 40% water. The manufacturer of the antifreeze suggests that, for summer driving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is 3.6 L, how much coolant should be drained and replaced with water to reduce the antifreeze concentration to the recommended level?
Please show all steps.
Click here to see answer by mangopeeler07(462)

Question 154254: 1. A 50 gallon barrel of milk is 4% butterfat. How much skim milk must be added to make a milk that is 1% butterfat?
a. Fifty gallons represents the amount of 4% butterfat milk. Choose a variable to represent the skimmed milk. Choose an expression to represent the final mixture.
b. Write the equation. This involves the amount of mixture times the percent of butterfat.
c. Solve the equation.

2.A candy store mixes plain and peanut m&ms. The plain cost $2.50 per pound and the peanut cost $3.00 per pound. How many of each should they mix to make a 5 pound mixture that they can sell for $2.70 per pound.
a. Choose a variable to represent the plain m&ms and an expression to represent the peanut m&ms.
b. Write the equation.
c. Solve the equation.

Click here to see answer by stanbon(75887)

Question 154285: My question is: Suppose that you have a supply of a 30%solution of alcohol
and 70% of solution of alcohol. how many quartz of each should be mixed to poduce 20 quartz that is 40%alcohol?
Click here to see answer by ptaylor(2198)

Question 154297: Production Design
A candy company makes a washer �shaped candy (a candy with a hole in it);because of increasing cost ,the company will cut the volume of candy in each piece by 22%.To do this, the firm will keep the same thickness and outer radius, but will make the inner radius larger. At present the thickness is 2.1mm,the inner radius is 2mm,and the outer radius is 7.1mm.Find the inner radius of the new-style candy(hint :the volume V of a solid disk is Pi r^2h , where r is the radius and h is the thickness of the disk)

Click here to see answer by stanbon(75887)

Question 154326: The sum of 1010 and five times a number is 3170. What is the number?
Click here to see answer by jim_thompson5910(35256)

Question 154328: Solution A is 80% Alcohol and Solution B is 50% Alcohol. How many Liters of each solutions should be mixed in order to make 100 Liters of a solution that is 68% alcohol?
Click here to see answer by scott8148(6628)

Question 154329: Y varies directly as X. When X is 33, Y is 165. Find Y, when X is 14.
Click here to see answer by ankor@dixie-net.com(22740)

Question 154401: A mechanic has found that a car with a 16-quart radiator has a 40% antifreeze mixture in the radiator. The mechanic has 70% antifreeze solution on hand. How much of the 40% solution would the mechanic have to replace with the 70% solution to get the solution in the radiator up to 50%.
Click here to see answer by ankor@dixie-net.com(22740)

Question 154570: If 40 liters of an acid solution is 75% acid, how much pure acid is there in the mixture?
Click here to see answer by BrittanyM(80)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245