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Question 15270: Bob has twice as much money as Anthony.
Anthony has $7 more than Lisa.
Together they have $73.
How much does each have?

Click here to see answer by rapaljer(4667)

Question 15294: If a plumber charges $110 for 3 hours and $160 for 5 hours. In keeping this rate how much will he charge for 8 hours?
Click here to see answer by rapaljer(4667)

Question 15293: How many liters of antifreeze must be added to 5 liters of water to make no less than a 60% solution and no more than an 80% solution?
Click here to see answer by rapaljer(4667)

Question 15639: This problem has me stumped bcause I have 8 ounces already mixed and need to add to it to get 12 ounces. If I was just adding enough chocolate syrup to make it 42 percent, I would not be so confused. Here is the problem:
I want to make the perfect 12 ounce cup of chocolate milk. It requires that the mixture is 42% chocolate syrup. What I have right now is 8 ounces of milk/syrup mixture that I know contains 30% syrup. What must the syrup concentration be in the remaining mixture that I must add in order to achieve perfection?
Click here to see answer by Earlsdon(6287)

Question 15837: 400 tickets were sold to a ballgame. Adult tickets were $2, Child tickets were $3. Tickets sold totaled $1050. How many of each ticket were sold.
Click here to see answer by kunal_122(19)

Question 16433: A chemist has 2.5 liters of a solution which is 70% acid. How much water should be added to obtain a 50% acid solution?
Click here to see answer by venugopalramana(3286)

Question 16444: A chemist has 2.5 liters of a solution which is 70% acid. How much water should be added to obtain a 50% acid solution?
Can somebody help me out. i absolutly dont know how to do these types of problem nor do i know where to start.
Click here to see answer by Earlsdon(6287)

Question 16587: A billboard is 7 meters long and 5 meters high. An advertiser wishes to increase its size by adding the same amount to its length and width. The new area will be 63 square meters. How much must be added to the length and width of the billboard to do this?
Click here to see answer by piglet162431(90)

Question 16767: How many ounces of 20% antifreeze solution must be mixed with 30 ounces of a 50% antifreeze solution to make a 40% antifreeze solution? I have no idea where to start on this. Please help
Click here to see answer by Earlsdon(6287)

Question 17662: A car radiator holds 24 L of a 20% antifreeze solution. How much of the 20% solution should be drained and be replaced with pure antifreeze to give a 40% antifreeze solution?
Click here to see answer by rapaljer(4667)

Question 12787: A coffee seller has one grade of coffee selling for $4 per pound and another for $6.50 per pound. He mixes the coffee to sell at $4.75 per pound and mixes 150 pounds. How much of each type does he use?
How do you do this?
Click here to see answer by LilSkittleMd(119)

Question 17727: Chocolate coffee beans sell for $7.00 per pound and hazelnut coffee beans sell for $6.10 per pound. One customer wants a 6 pound mixture of both types of coffee. How many pounds of each should be used if the mixture is to cost $6.40 per pound?
I have tried making tables,and writing an equation from each, but I keep getting the wrong answer and I am very confused. I need to know how to set these up to solve them, then I will be fine. It is the writing of the initial equation that I can't figure out.
Thanks for your help.
Click here to see answer by LilSkittleMd(119)

Question 18209: what two whole numbers when added together the sum is 123,when i subtract the lesser number from the greater number the difference is 45 ?
Click here to see answer by josmiceli(9686)

Question 18425: Mary had a beaker filled with water. She gave 1/2 to Jim and used 1/2 for herself. She had 225 ml left. How much was originally in the beaker?
Click here to see answer by MelanieBCC(40)

Question 18703: Bill Bilderback, a druggist, needs 1000 milliliters of a 10% phenobarbital solution. He has only 5% and 25% phenobarbital solution available. How many milliliters of each solution should he mix to obtain the desired solution?
I'm also supposed to put this in a linear systems form, if that makes sense. Thank you for your help.
Click here to see answer by Earlsdon(6287)

Question 18599: Need help with this, The inlet pipe of an oil tank can fill the tank in 1 hour, 30 minutes. The outlet pipe can empty the tank in 1 hour. How long does it take to empty the tank if both pipes are open?
Click here to see answer by venugopalramana(3286)

Question 18937: In the puzzle called the Tower of Hanoi, the object is to use a series of moves to take the rings from peg and stack them in order on another peg. A move consists of moving exactly one ring,and no ring may be placed on top of a smaller ring.the minimun numbers of moves required to move n rings is 1 for 1 ring, 3 for 2 rings, 7 for 3 rings, 15 for 4 rings, and 31 for 5 rings.Find a formula for the sequence.What is the minimun number of moves required to move 6 rings
Click here to see answer by venugopalramana(3286)

Question 19005: My question is: If you have 60 grams of a solution that is 32% sugar, how much sugar do you add to make it 50% sugar.
I found this question and tried to go by it (my answers are second) and came up with a negative number so I know I am wrong. Please help!
Question 16433: A chemist has 2.5 liters of a solution which is 70% acid. How much water should be added to obtain a 50% acid solution?
Answer by venugopalramana(287) (Show Source):
chemist has 2.5 60 grams liters of a solution which is 70% 32 acid. How much water sugar should be added to obtain a 50% 50% acid solution?
qty.of solution = 2.5 l 60g
% acid in solution = 70 32
hence qty.of acid in the solution = 2.5*70/100 = 1.75 l (60*32/100= 19.2)
required percentage = 50 50
let the water to be added = x l xG
total qty.of solution = (2.5+x) l (60+x)G
qty of acid = same as before = 1.75 l 19.2 G
% acid in the new solution = 1.75*100/(2.5+x) = 50 as given 19.2*100/(60+x)=50
175= 50(2.5+x) 1920 = 50(60+x)
2.5+x = 175/50 = 3.5 60+x = 1920/50 = 38.4
x= 3.5 - 2.5 = 1 litre x = 38.4 -60 x=-21.6

Click here to see answer by Earlsdon(6287)

Question 19110: I Need help on this one. Some corn costing 60 cents per kilogram is added to 50 kilograms of oats costing 90 cents per kilogram to make an animal feed costing 75 cents per kilogram. How many Kilograms of corn should be added.
So far i have .60(x+50)+.50(90)=.75+x
Click here to see answer by Paul(988)

Question 18208: what two whole numbers when added together the sum is 123,when i subtract the lesser number from the greater number the difference is 45 ?
Click here to see answer by mmm4444bot(95)

Question 19184: A movie theater sells adult tickets at $5.50 a ticket and $3.50 for a childs ticket. How many of each ticket was sold if 21 tickets were bought for $83.50
Click here to see answer by Paul(988)

Question 19575: at a restaurant, the bill for two coffees and 3 hot chocolates as 10.95. At another table the bill for one coffee and 2 hot chocolates was 6.65. How much did each type of beverage cost?

I really appreciate your help. I don't even know where to begin.
Click here to see answer by mmm4444bot(95)

Question 20069: in one basketball game Maria scored three times as many points as holly. in the next game, maria scored 7 fewer points than she did in the first game, while holly scored 9 more points than she did in the first game. if they scored the same number of points in the second game, how many points did each score in the first game?
Click here to see answer by Paul(988)

Question 20245: How do I calculate;
I have 2 wells, well A produces water with 18 ppb of a mineral
Well B produces water with 3 ppb of the same mineral.
How many gallons per minute should I blend of well A water with how many gallons per minute of well B water to produce a combined water with a 5 ppb concentration when I need to pump 2400 Gallons per minute total flow from both wells?
Click here to see answer by josmiceli(9686)

Question 20530: hello,
If someone can help me with this problem that would be great i know we went over this in class but i,m still not sure of the answer the problem is:
Construction safety standards vary state to state. One state guideline for safewheelchair ramp construction requires 25 ft. of horizontal distance for every 1 foot vertical drop/rise. The A.D.A. is a national organization of disabled people. They set safe ramp slopes between 3% and 5%. I'm to show how the state above is in compliance with A.D.A. (or not).do i take the fraction 1/25 and divide the percents to get two seerate answers to show if it's in compliance at 3 and 5 %? thanks!
Click here to see answer by Earlsdon(6287)

Question 21000: A dealer has tea worth $1.20 a pound and tea worth $1.90 a pound. How many pounds of each kind must he use to make 70 pounds that can be sold for 1.25 per pound?
Click here to see answer by Paul(988)

Question 21098: please help with this word problem. I need the equation to figure this out. thanks in advance. this website is great!
Ellen wishes to mix candy worth $1.90 per pound with candy worth $3.50 per pound to form 32 pounds of a mixture worth $2.80 per pound. How many pounds of the more expensive candy should she use?
thanks again,
Click here to see answer by Paul(988)

Question 21324: A baker mixes cookies worth $0.95 per pound with cookies worth $1.70 per pound. How many of each kind must be used to produce a 45 pound mixture that sells for $1.25 a pound. I have a benchmark test tomorrow and i don't get how to set up the equations!! If you could tell me how, that would be great.
Click here to see answer by Paul(988)

Question 21309: The proublem is:

The school production of our school was a big success. For opening night, 410 tickets were sold. Students paid $3 each, while non-students paid $7 each. If a total of $1650 was collected, how many students and how many non-students attended?

I tried using an algebra equation to answer the question but I couldn't figure it out. The answer I got was 123= students and 287= non-students. Although I did try guess and check and I came up with the correct answer 105= students and 305= non-students. Can you please help me come up with an equation?
Click here to see answer by Paul(988)

Question 21322: Solution A, which is 10% iodine, is mixed with solution B which is 18% iodine, to obtain 320 grams of a solution that is 15% iodine. How many grams of solution A and how many grams of solution B is needed for the 15% iodine solution?
Click here to see answer by Kuroinu(8)

Question 21810: a chemist needs 10 liters of a 50% salt solution. all that is available is a 20% salt solution and a 70% salt solution. how much of each of the 2 solutions should she mix to obtain her desired solution?
a) 5 liters of the 20% solution; 5 liters of the 70% solution
b) 3 liters of the 20% solution; 7 liters of the 70% solution
c) 2 liters of the 20% solution; 8 liters of the 70% solution
d) 4 liters of the 20% solution; 6 liters of the 70% solution
Click here to see answer by Paul(988)

Question 21993: It would be nice if someone could show me how to solve this mixture problem. Thanks in advance.
A 15 liter bucket of soda contains a mixture with a concentration of 50% corn syrup. How much of this mixture x must be withdrawn and replaced by 100% corn syrup to bring the mixture up to a concentration of 60% corn syrup?
x=________liters
Click here to see answer by Paul(988)

Question 22596: a store room has an 80% alcohol solution and a 30% alcohol solution. How many milliliters of each should be used to obtain 50 milliliters of a 60% solution?
Click here to see answer by stanbon(57361)

Question 22542: I really need help for this problem!
The capacity of an automobile cooling system is 16 quarts. It is half full of a 15% antifreeze solution. The owner is adding 2 gallons (another 8 qts.) of a 90% solution. When he is finished, what will the solution's percentage be?
Any help would be greatly appreciated!
Click here to see answer by Earlsdon(6287)

Question 22541: Help! I can't even think of a good equation for this problem!
Brine is a solution of salt and water. If a tub contains 50 pounds of a 5% solution of brine, how much water must evaporate to change it to an 8% solution?
Any help would be greatly appreciated!
Click here to see answer by wuwei96815(245)

Question 22531: If you boil 3 gallons of 10% salt water until ther is only 2 gallons of water. What is the percent of salt when you finish?
Next question is:
Dilute 35 gallons of 40% acid with 7 gallons of water. What is the amount and strength of the mixture?
Click here to see answer by stanbon(57361)

Question 22706: How many 80% alcohol solution must be mixed with 40 gallons of a 13% solution to obtain a solution that is 70% alcohol?
Click here to see answer by Earlsdon(6287)

Question 22859: a dealer wishes to mix coffee worth 65 cents per pound with coffee worth 90 cents per pound to make a mixture of 40 pounds which will be sold at 75 cents per pound. how many pounds of each typeshould be used?
Click here to see answer by Paul(988)

Question 22895: One leg of a right triangle is 4cm shorter thatn the other leg. The length of the hypotenuse is 20 cm. Find the length of the shorter leg.
A. 16cm
B. 17cm
C. 13cm
D. 12cm
Click here to see answer by wuwei96815(245)

Question 22894: In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of a 10% solution are needed?
A. 4.5L
B. 2.5L
C. 7.0L
D. 3.5L
Click here to see answer by Paul(988)

Question 22957: Please help me, i had a hard time to answer these questions. Thank you! Here it goes, how much water must be evaporated from 18 kilograms of a 20% salt solution to produce a 50% solution?
Click here to see answer by rapaljer(4667)

Question 22951: Hi could i please have help with this......

One canned juice drink is 30% orange juice; another is 5% orange juice. How many liters of each should be mixed together in order to get 25L that is 22% orange juice?
thank you
Click here to see answer by longjonsilver(2297)

Question 23012: Karen spends one-fourth of her weekly allowance on sodas each week. if she spends $1 each day on sodas, what is her weekly allowance.(1 week = 7 days

Click here to see answer by rapaljer(4667)

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