Questions on Word Problems: Mixtures answered by real tutors!

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Question 125273:
A swimming pool contains 40000 gallons of water. How many gallons of chlorine must be added to "shock the pool" and bring the water to a 37/100 % solution?
I honestly have no idea I thought that you just needed to multiply the two..which would be 148 gallons, but when I enter that it keeps saying incorrect on my online homework. Please help me :(
Thank you,
Aryn
Click here to see answer by checkley71(8403)

Question 125272: A chemist wants to mix a 60% saline solution with 20 liters of a 45% saline solution to obtain a 55% saline solution. How much of the 60% solution should she use?
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Question 125288: How many gallons of an 80% alcohol solution must be mixed with 30 gallons of a 22% solution to obtain a solution that is 70% alcohol?
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Question 125657: Two planes leave an airport at the same time, one flying east, the other flying west. The eastbound plane travels 150 mph slower. They are 2250 mi apart after 3 hrs. Find the speed of each plane.
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Question 125655: Monica Hugo, who is one Crystal's best customers, wants to buy two kinds of beans: Arabian Mocha ($8.50lb) and Colombian Decaf ($8.00lb). If she wants twice as much Mocha as Colombian decaf, how much of each can she buy for a total of $87.50?
Click here to see answer by josmiceli(9817)

Question 125706: A grocer wants to mix peanuts and cashews to produce 20lbs. of mixed nuts worth $6.20/lb. How many pounds of each kind of nut should she use if peanuts cost $4.80/lb and cashews cost $8/lb?
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Question 125653: How many liters of a 60% acid solution must be mixed with a 75% acid solution to get 20 liters of 72% solution?
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Question 125804: A table is three times as long as it is wide. If it were 3 ft shorter and 3 ft wider, it would be square (with all sides equal). How long and how wide is the table?
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Question 125802: Two cars start from towns 400 mi apart and travel toward each other. They meet after 4 hrs. Find the speed of each car if one travels 20mph faster than the other.
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Question 125803: Kevin is three times as old as Bob. Three years ago the sum of their ages was 22yr. How old is each now?
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Question 125809: Paula received a paycheck for $585 for her weekly wages less 10% deductions. How much was she paid before the deductions were made?
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Question 125553: This problem is not in a book it is a hand out.
If the mixture is P% gasoline, prices at $1.60 per gallon, and (100-P)% alcohol, priced at $1.00 per gallon, write a formula for the price of a gallon of gasahol.
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Question 125825: two gasahol mixtures are available one contains4.5%alcohol,and the other contains9.75%alcohol.How much of each do you need to mix up 300 liters of gasahol containing 7.25%alcohol
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Question 126163: Oolong tea sells for $19 per pound. How many pounds of Oolong should be mixed with regular tea selling at $4 per pound to produce 50lb of tea selling for $7 per pound?
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Question 126207: I have tried this problem about 10 different ways but I can't seem to get it!! Help!!!
A merchant has coffee worth $20 a pound that she wishes to mix with 30 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $20 coffee should be used?
Click here to see answer by edjones(7569)

Question 126279: The manager of a coffee shop sells chocolate covered peanuts for $6 dollars per pound and chocolate covered cashews for $15 dollars per pound. The manager wishes to mix 70 pounds of the cashews to get a cashew-peanut mixture that will sell for $13 dollars per pound. How many pounds of peanuts should be used?
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Question 126333:
In a chemistry class, 12 L of a 12% alcohol solution must be mixed with a 2% solution to get a 14% solution. How many liters of 20% solution are needed?
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Question 126274: A chemist needs 90 milliliters of a 78% solution, but has only 43% and 88% solutions available. Find how many milliliters of each should be mixed t oget the desired solution.
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Question 126447: The sum of two numbers is 89. Adding four times the first number to the second number gives 155. Express as a algebraically equation?
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Question 126446: The differance between two numbers is 15. When twice the smaller number is subtracted from three times the larger number, the difference is 58. What is the larger number?
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Question 126449: A person invested $10,000.00. The greater part is invested at 6% and the remainder at 5%. The annual income from the greater part is $160.00 more than the annual income from the smaller part. What is the smaller part of the investment?
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Question 126448: What amount of each mixture, one 95% alcohol and the other 15% alcohol, must be used to make 10 liters of a mixture which is 45% alcohol? What equations will express this problem?
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Question 126558: Two trains leave a city at the same time. One travels north, and the other travels south 20 mph. faster. In 2 hr, the trains are 280 miles apart. Find their speeds.
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Question 126568: In a chemistry class, 12 L of a 12% alcohol solution must be mixed with a 2% solution to get a 14% solution. How many liters of the 20% solution are needed?
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Question 126581: If you mix a 50% concentrate acic solution and a 20% concentrate acid solution and you end up with 40 gallons of a 42.5% concentrate acid solution, how much of the 50% and 20% solution did you use.
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Question 126591: The volume V of a given mass of gas varies directly as the temperature T and inversely as the 19)
pressure P. If V = 465.0 in.3 when T = 310° and P = 10 lb/in.2, what is the volume when T = 300°
and P = 20 lb/in.2?
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Question 126615: A 60 mililiter solution has 50% acid. How much pure water is needed to get 30% acid?
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Question 126621: A 60 mililiter soulution has 50% acid. How much pure water is needed to get 25% acid.
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Question 126622: This is on page 228 of textbook.
Marcie Waderman is having a holiday party at her house. She made 2 gallons of punch solution that contains 2% alcohol. How much pure punch must Marcie add to the punch to reduce the alcohol level to 1.5%?
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Question 126773: How many pounds of pecans, sold at $5.60 per pound would be mixed with 2 pounds of cashews, sold at $3.50 to create a mixture that sells for approximately $4.34 per pound?
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Question 126875: How many pounds of a 12% aluminum alloy must be mixed with 400 pounds of a 25% aluminum alloy to make a 17% aluminum alloy?
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Question 127170: Please help me. I have done this and it is wrong. I am grateful for any help.
Soymeal is 12% protein and cornmeal is 6%. How many pounds of each should be mixed together to get 240 pound mixture that is 7% protein? Thanks so much...
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Question 127218: My math teacher, unfortunately, never taught me how to do this kind of supposed "mixture" problem: With a tailwind, a jet flew 2000 miles in 8 hours, but the return trip against the wind required 10 hours. Find the jet's speed and the wind speed.
Click here to see answer by stanbon(57984)

Question 127260: I'm not sure if this is a mixture equation, but: The sum of the digits of a two digit number is 11. The number obtained by reversing the order of the digits is 27 less than the original number. Find the original number.
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Question 127449: Ellen wishes to mix candy worth $1.56 per pound with candy worth $2.60 per pound to form 20 pounds of a mixture worth $2.29 per pound. How many pounds of the more expensive candy should she use?
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Question 127486: I got stuck on this problem here: When Jim cleaned out the fountain in front of the mayor's house, he found 20 nickels and quarters. The mixture of coins totaled up to $2.60. How many quarters did Jim find?
Thanks in advance!
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Question 127531: How many gallons of a 25% acid solution must be mixed with 100 gallons of a 6% acid solution to obtain a solution that is 20% acid?

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Question 127627: 3. Name the coordinate described here:
From the origin, the point is three places to the right and eight places down.

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Question 127588: suppose that a supermarket sells cashews for 4.50 per pound and pecans for 6.50 a pound how many pounds of each are needed to obtain a mixture of 40lbs that can be sold for 5.85 per pound
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Question 127714: A painter works on a job for 10 days and is then joined by her helper. Together they finish the job in 6 more days. Her helper could have done the job alone in 30 days. How long would it have taken the painter to do the job alone?
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Question 127775: an orchard operator must dilute 11 quarts of 60% insecticide solution by adding water. How many quarts of water should be added to get a mixture that is 2% insecticide?
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Question 127798: I have a 10-ounce glass of kool-aid that is 30% sugar. I want to make it less sweet. How much water can I add to the 30% solution to make it only 25% sugar.
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