Questions on Word Problems: Mixtures answered by real tutors!

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Question 510000: A radiator contains 13 quarts of fluid, 25% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 50% antifreeze?
Click here to see answer by ankor@dixie-net.com(22740)

Question 510304: chemical is 60% acid and chemical B is 36% acid. How much of each should be mixed together to get 120oz of a chemical that is 52% acid?
Click here to see answer by oberobic(2304)

Question 510418: how many liters of a 25% alcohol solution must be mixed wuth a 12% solution to get 13 liters of 15% solution.
Click here to see answer by Maths68(1474)

Question 510357: a boat owner mixes together oil and gasoline to make 12 gallons of fuel for 8$ per gallon. Oil cost $15 per gallon and gasoline cost $3 per gallon. hOW MANY GALLONS OF EACH SHOULD USED???

Click here to see answer by Maths68(1474)

Question 509589: Rhine river is 160km shorter than St lawerence. The amazon is 800km longer than 5 times the length of the Rhine. Zambezi is is 2x as long as the St lawerence. How long is the Amazon if it is 1440km longer than the sum of the lenghts of the other 3 rivers
Click here to see answer by Maths68(1474)

Question 510652: 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 THE 10% SOLUTION ARE NEEDED?
Click here to see answer by ptaylor(2198)

Question 510840: Larry Mitchell invested part of his 34,000 advance at 7% annual simple interest and the rest at 9% annual simple interest. If his total yearly interest from both accounts was $2,420, find the amount invested at each rate.
I just really need helping breaking it down to solve it.
Click here to see answer by scott8148(6628)

Question 510965: A radiator contains 14 quarts of fluid, 25% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 50% antifreeze? (Round your answer to two decimal places.)

Click here to see answer by mananth(16946)

Question 511163: a company wants to mix 25 pounds of peanuts worth $3 a pound with cashews worth $6 a pound in order to make an experimental mix worth $4.50 a pound. How many pounds of cashews should be added to the peanuts?
Click here to see answer by Alan3354(69443)

Question 511177: How many kilograms of a 15% copper alloy must be melted with a 45% copper alloy to obtain 60 kilograms of a 32% copper alloy?
I tried to do it this way: 0.45x-0.15x=.32(60), but it didn't work. I don't know how to do these kinds of problems. I don't know how to turn them into equations. Can somebody please help me? And can somebody show me how to do it the way that I just tried, with the decimals before them, please?
Click here to see answer by Maths68(1474)

Question 511241: A radiator contains 9 quarts of fluid, 40% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 55% antifreeze?
Click here to see answer by josmiceli(19441)

Question 511305: How many milliliters of orange puree must be mixed with 300 ml of 30% orange to obtain 45% orange concentrate?
Click here to see answer by stanbon(75887)

Question 511304: how many milliliters of water must be added to 250 ml of 25% salt solution to reduce its concentration to 10%
Click here to see answer by stanbon(75887)

Question 511311: how many milliliters of water must be added to 250 ml of 25% salt solution to reduce the concentration to 10%
Click here to see answer by josmiceli(19441)

Question 511301: A radiator contains 13 quarts of fluid, 20% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 50% antifreeze? (Round your answer to two decimal places.)

Click here to see answer by josmiceli(19441)

Question 511384: A radiator holds 16 quarts full of a solution with 30% alcohol. How much of this solution must be drawn off and replaced with pure alcohol in order that the contents of the radiator has 55% alcohol?
I really need to know both the solution and the answer, because I have a lot of other problems like this that are quite difficult... :S
Click here to see answer by mananth(16946)

Question 511467: A lab assistance want to make 5 liters 25.6% acid solution. if solutions of 40% and 16% are in stock, how many liters of each must be mixed to prepare the solution?

Click here to see answer by oberobic(2304)

Question 511529: What quantity of a 60% acid solution must be mixed with a 20% solution to produce 200 mL of a 55% solution?

I don't know what to try, everything the book has to say on this problem provides no help what-so-ever.
Click here to see answer by oberobic(2304)

Question 511594: coffe A normally costs 75 cents per pound. it is mixed with coffee B, which normally cost 80 cents per pound, to form a mixture that cost 78 cents per pound. If there are 10 pounds of the mix, how many pounds of coffee A were used in the mix?
Click here to see answer by stanbon(75887)

Question 511640: A fuel blend is made from mixing 4 quarts of oil at $ 1.40 per quart with 2 gallons of gasoline at $1.85 per gallon. What is the cost of a gallon of the fuel mixture?
Click here to see answer by oberobic(2304)

Question 511614: A chemist has four solutions of a very rare and expensive chemical that at 15% acid (cost $120 per ounce), 20% acid (cost $180 per ounce), 35% acid (cost $280 per ounce) and 45% acid (cost $359 per ounce). She requires 200oz of a 29% solution. Find the combination of any two of these concentrations that will minimize the total cost of the mix.
Click here to see answer by Alan3354(69443)

Question 511809: 50% if what number is 15

Click here to see answer by John10(297)

Question 511841: How many gallons of a liquid that is 74 percent alcohol must be combined with 5 gal of another that is 90 percent alcohol to obtain a mixture that is 84 percent alcohol?

Click here to see answer by stanbon(75887)

Question 511879: How would I solve this problem?
Someone invested $1200 at a certain interest rate and $2200 at a rate that is 3% higher. The person's annual earnings were 253. Find the two interest rates.
Thank you!
Click here to see answer by stanbon(75887)

Question 511871: How many liters of water must be added to 2 liters of pure alcohol to obtain a 10% solution?
Click here to see answer by dango24(4)

Question 511931: How many liters of a mixture containing 70% alcohol should be added to a mixture containing 20% alcohol to obtain 16 liters of a mixture containing 50% alcohol?
Click here to see answer by nerdybill(7384)

Question 512049: WHAT VOLUME OF A 60% HYDROCHLORIC ACID SOLUTION MUST BE ADDED TO A 100 ML OF A 30% HYDROCLORIC SOLUTION TO MAKE A 36% HYDROCLORIC SOLUTION?
Click here to see answer by oberobic(2304)

Question 512150: An isosceles triangle has two sides of equal length. The length of one of the eqaul sides is 2 more than three times the length of the third side. If the perimeter is 46 m, find the length of each side.
I need to translate this sentence into an equation and then solve
Click here to see answer by rfer(16322)

Question 512137: A chemist is mixing three chemicals to get 15 liters of a 6% solution. How much of each of 3%, 7%, and 9% solutions should he use if he must use twice as much of the 3% as the 9% solution?
Click here to see answer by Maths68(1474)

Question 511886: How many liters of a 40% and 80% acids must be mixed in order to make 20 liters of a 55% acid solution?

A 12 liter mixture is 60% alcohol. if 8 liters of a 25% alcohol mixture are added, what percent mixture will be formed.

Click here to see answer by Maths68(1474)

Question 511410: How much water should be added to 100 liters of 90% alcohol concentration to dilute it to 75% alcohol concentration?
Click here to see answer by Maths68(1474)

Question 512253: A vendor has mangoes that sell for Php 10.00 and Php 12.50 each. How many pieces of each must be mixed together to make 90 pieces of mangoes thet would be sold at Php 11.75 per pieces?
Click here to see answer by Maths68(1474)

Question 512337: 70% of 5401.00 dollars
Click here to see answer by nerdybill(7384)

Question 512341: how many liters of a35% solution of alcohol should be mixed with 30 liters of 55% solution to make up a 47% solution
Click here to see answer by Maths68(1474)

Question 512362: A merchant has coffee worth$30 a pound that she wishes to mix with 30 pounds of coffee worth $70 a pound to get a mixture that can be sold for $40 a pound,How many pounds of the $30 coffee should be used?
Click here to see answer by Maths68(1474)

Question 512599: My number has seven tens and five thousands. It has double the number of ones as hundreds. The sum of the digits is 15. This is an word problem for 2nd grAde
Click here to see answer by solver91311(24713)

Question 512591: A ferry leaves a harbor and travels to a resort island at an average speed of 20 mph. On the return trip, the ferry travels at an average speed of 10 mph because of fog. The total time for the trip is 6 h. How far is the island from the harbor?
Click here to see answer by josmiceli(19441)

Question 512728: Cement Mix:
A 20-pound bag of Economy brand cement mix contains 25% cement and 75% sand. How much pure cement must be added to produce a cement mix that is 40% cement?
I know the answer is 5 pounds needed to be added, but I am not sure how to put this into a table?
Click here to see answer by stanbon(75887)

Question 512742: Critical Thinking:
Without solving, explain what is wrong with the following mixture problem: How many liters of 25% ethanol should be added to 20 liters of 48% ethanol to obtain a solution of 58% ethanol? Now go through an algebraic solution. What happens?
Click here to see answer by oberobic(2304)

Question 512903: How many kg of dies apricots worth 8.30 per kilogram should be mixed with dried apples worth 6.50 per kilgram to produce 12 kg of a mixture worth 6.95 per kilogram?
Click here to see answer by stanbon(75887)

Question 513002: how many liters of pure alcohol must be added to 15 liters of 20% solution to obtain a mixture which is 30 % alcohol?
Click here to see answer by Maths68(1474)

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