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Question 122009: British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 244 grams of a copper-silver alloy that is 13% copper by weight?
Please round the answers to the nearest tenth.
British sterling silver: g
pure copper: g

Click here to see answer by ankor@dixie-net.com(22740)

Question 122103: what is the answer to A grocer mixes two kinds or nuts. One kind costs $5.00/kg and the other $5.80/kg. How manykilogramsof each type are neededto make 40kg of a blend worth $5.50.
Click here to see answer by checkley71(8403)

Question 122323: A pharmicis has 200 milliliters of a solution that is 40% active ingredient. How much pure water should she add to the solution to get a solution that is 25% active ingredient?
Click here to see answer by checkley71(8403)

Question 122501: an alloy of tin is 15% tin weighs 20 pounds. a second alloy is 10% tin. how much of the second alloy must be added to the first alloy to get a 12% mixture.

the amount would be ( ) pounds
Click here to see answer by ankor@dixie-net.com(22740)

Question 122571: A health food store sells seasoning blends in bulk. One blend contains 20% basil. Shelia wants to add pure basil to some 20% blend to make 16 ounces of her own 30% blend. Let b represent the amount of basil Shelia should add to the 20% blend.
Click here to see answer by checkley71(8403)

Question 123078: A mechanic is working on a car with a 20-qt radiator containing a 60% antifreeze solution. HOw much of the solution should he drain and replace with pure water to get a solution that is 50% antifreeze.
Click here to see answer by checkley71(8403)

Question 123286: How many ounces of water should a chemist mix with 16 ounces of a 25% sulfuric acid solution to reduce it to a 10% solution?
Click here to see answer by stanbon(75887)

Question 123286: How many ounces of water should a chemist mix with 16 ounces of a 25% sulfuric acid solution to reduce it to a 10% solution?
Click here to see answer by Superownage(7)

Question 123198: The difference between two positive nubers is 5 and the sum of their squares is 233. What are the numbers?
Click here to see answer by MathLover1(20850)

Question 123158: A forester mixes gasoline and oil to make 2 gallons of mixture for his two cycle chain-saw engine. This mixture is 32 parts gasoline and 1 part two cycle oil. How much gasoline must be added to bring the mixture to 40 parts gasoline and part oil?
Click here to see answer by ankor@dixie-net.com(22740)

Question 123383: This problem has me perplexed. Help me please!
How many pounds of a chicken feed that sells for $5 per pound must be mixed with
400 pounds of a feed that sells for $8 per pound to make a chicken feed that sells for $7.50?
Click here to see answer by checkley71(8403)

Question 123404: A solution of saltwater is 10% salt and weighs 50 lbs. How much salt is added to produce a solution that is 25% salt (in lbs)?
Click here to see answer by checkley71(8403)

Question 123407: An alloy of tin is 16% tin. How much tin must be added to make 820 lbs of alloy that is 18% tin? Answer to the nearest tenth.
Click here to see answer by checkley71(8403)

Question 123412:
A seedman has seeds worth $0.50 per pound mixed with seeds worth $0.80 per pound. If he wishes to make a mixture of 30 lbs to sell at $0.75 per pound, how many pounds of each should he use?
5 lbs of $0.50
25 lbs of $0.80
Click here to see answer by checkley71(8403)

Question 123406: A grocer buys walnuts for $0.45/lb. and pecans for $0.60/lb. If the nuts must be combined for a 90 lb. mix worth $0.55/lb, how many pounds of walnuts must be added?
Click here to see answer by ankor@dixie-net.com(22740)

Question 123566: How much acid must be added to 40ml of a 20% solution to increase it to a 28% solution?
Click here to see answer by chitra(359)

Question 123565: A vat contains 100 l of a 40% solution. How much acid must be added to increase the acidity to 60%?
Click here to see answer by chitra(359)

Question 123565: A vat contains 100 l of a 40% solution. How much acid must be added to increase the acidity to 60%?
Click here to see answer by josmiceli(19441)

Question 123564: A tub contains 300 l of a 32% salt solution. How much water must be added to reduce it to a 20% solution?
Click here to see answer by josmiceli(19441)

Question 123639: A chemist has one solution that is 25% salt and 75% water and another solution that is only 5% salt. How many milliliters of each should the chemist use to make 1600mL of a solution that is 15% salt?
Click here to see answer by josmiceli(19441)

Question 123637: A druggist has two mixtures of a certain chemical and water, one containing 10% of the chemical and the other containing 40% of the chemical. How much of each mixture should he use to make 10 ounces that contain 25% of the chemical?
___oz of each
I'd appreciate any help. Thanks in advance!
Click here to see answer by checkley71(8403)

Question 123752: Pure copper was mixed with a 23% copper alloy to produce an alloy that was 32% copper. how much of each were used to produce 44kg of 32% alloy?
Click here to see answer by checkley71(8403)

Question 123782: kerri said that they needed about 1 34 cups of sugar for each cake and they had to make 15 cakes how much sugar did they need for 15 cakes
Click here to see answer by checkley71(8403)

Question 123783: the total batter for the cakes made about 11 1/2 cups how much batter was used in each of 15 cakes ?
Click here to see answer by checkley71(8403)

Question 123712: One pipe can fill a tank in 24 minutes. A second pipe can fill it in 8 minutes and a third pipe can fill it in 12 minutes. If the tank is empty, how long will the three pipes operating together take to fill it?
____minutes
**THANKS**
Click here to see answer by scott8148(6628)

Question 123591: An alloy of silver and gold is to be recast with an addition of silver. The alloy consists of 80 oz, of which 10 oz are gold. If the new alloy is to have only 1/5 of gold in 5 oz, how much silver must be added?
___oz
Click here to see answer by ankor@dixie-net.com(22740)

Question 124264: What quantity x of a 75% acid solution must be mixed with a 25% solution to produce 500 ml of a 55% solution?
I have tried these equations
.75x+.25(.55*500)=500(.55)

Click here to see answer by jim_thompson5910(35256)

Question 124265: A merchant blends tea that sells for $3.45 a lb. with tea that sells for $1.75 a lb. to produce 70 lb. of a mixture that sells for $2.75 a lb.
Contains
? of the $3.45 a lb
? $1.75 a lb.
Click here to see answer by josmiceli(19441)

Question 124194: This a mixture problem
How much orange juice at $0.42/liter should be mixed be grapefruit juice worth $0.32/liter to make 200 liters of a mixture worth $0.36/liter?
I'd appreciate your help. Thanks!
Click here to see answer by ptaylor(2198)

Question 124279: Problem
A boxing ring is in the shape of a square 20ft on each side. How far apart are the firefighters when thay are in opposite corners of the ring?

Thank
Click here to see answer by stanbon(75887)

Question 124249: How many grams of pure silver must a silversmith mix with a 45% silver alloy to produce 200 grams of a 50% alloy?
Click here to see answer by ankor@dixie-net.com(22740)

Question 124343: how many gallons of a 12% salt solution must be mixed with 6 gallons of a 20% salt soution to obtain a 15% salt solution?
100(.12)(x)+100(.20)(6)=.15%(100)
12x+20(6)=15 12x+120=15
-120=-120
12x=-105
Click here to see answer by ptaylor(2198)

Question 124447: A card company mixes two varieties of cards. Embossed cards cost $.65 each, and regular cards $.40 each. How many cards of each type should be included in an assortment of 25 cards that costs $14?
Click here to see answer by stanbon(75887)

Question 124387: christie wants to dilute a 10% soap solution with water to make 10 gallons of a 3% soap solution. How much water and how much 10% solution should she mix together?
Click here to see answer by ankor@dixie-net.com(22740)

Question 124543: A chemist wishes to strengthen a mixture from 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 liters of the 10% mixture?
Click here to see answer by Earlsdon(6294)

Question 124567: A dealer mixed some coffee worth $.80 per pound with coffee worth $.50 per pound to make a mixture to be sold for $.70 per pound. If the number of pounds of $.80 coffee was 10 more than the number of pounds of the $.50 coffee, how many pounds of each kind did he use?
Click here to see answer by Earlsdon(6294)

Question 124563: How many pounds of candyworth $3.60 per pound must be added to 10 pounds of chocolate worth $2.40 per pound to form a mixture worth $3.30 per pound?
Click here to see answer by checkley71(8403)

Question 124852: 2. Two cars started from the same point and traveled on a straight course in opposite directions for exactly 2 hours, at which time they were 208 miles apart. If one car traveled, on average, 8 miles per hour faster the the other car, what was the average speed for each car for the 2-hour trip?

Click here to see answer by stanbon(75887)

Question 124853: 3. A group can charter an aircraft at a fixed total cost. If 36 ppl charter the aircraft rather than 40, then the cost per person is greater by $12. What is the cost per person if 40 people charter the aircraft?

Click here to see answer by stanbon(75887)

Question 124726: For a certain experiment, a student requires 300 ml of a solution that is 13% HCl (hydrochloric acid). The storeroom has only solutions that are 10% HCl and 15% HCl. How many milliliters of each available solution should be mixed to get 300 ml of 13% HCl?
Could you please explain to me how to solve this problem?
Click here to see answer by ankor@dixie-net.com(22740)

Question 124851: 1. Pat invested a total of $3000. Part of the money yields 10 percent interest per year, and the rest yields 8 percent interest per year. If the total yearly interest from this investment is $256, how much did Pat invest at 10 percent and how much at 8 percent?

Click here to see answer by scott8148(6628)

Question 124946: Mixing 100% antifreeze with 40% antifreeze to get 20 quarts of 50% antifreeze
Click here to see answer by checkley71(8403)

Question 125072: 33 1/3% of a number is 3 2/3. Find the number.
Click here to see answer by Fombitz(32388)

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