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# GRE Math Challenge #28-Mixture Problems

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CEO
Joined: 07 Jun 2014
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GRE Math Challenge #28-Mixture Problems [#permalink]  06 Nov 2015, 19:32
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5% (low)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions
Mixture A is 15 percent alcohol, and mixture B is 50 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 30 percent alcohol, approximately how many gallons of mixture A are in the mixture?

[Reveal] Spoiler: Answer
2.3

A chemist needs to mix a 10 % acid solution with 35% acid solution to end up with 1000 milliters of a 25% acid solution. How much of each solution is needed?
[Reveal] Spoiler: Answer
400, 600

If 3 liters of 40% orange juice and 1 liter of 50% orange juice are mixed which of the following is the percentage of orange juice in the mixture?
[Reveal] Spoiler: Answer
42.5%

One liquid solution of 7 liters contains 40 % water. A second liquid solution of 18 liters contain 20% water. If these two solutions are mixed, what percent of the mixture is water?
[Reveal] Spoiler: Answer
25.6%

Dr. Tik needs to make a solution that is 60% alcohol. if she has 4 liters of a solution that is 25% alcohol, how many of 80% solution will she need to add?
[Reveal] Spoiler: Answer
2.5 lit

A mixture of 12 ounces of vinegar and oil is 40%n vinegar by weight. How many ounces of oil must be added to the mixtue to produce a new mixture that is only 25% vinegar?
[Reveal] Spoiler: Answer
7.2 ounce

Two solutions of 90% and 97% purity are mixed resulting in 21liters of mixture of 94% purity. How much is the quantity of the first solution in the resulting mixture?
[Reveal] Spoiler: Answer
9 liters

A mixture of 20ltrs of brandy and water contains 10% water. How much water should be added to it to increase the percentage of water to 25%?
[Reveal] Spoiler: Answer
4 liters

A cistern contains 50 liters of water. 5 litres of water is taken out of it adn replaced by wine. The process is repeated again. Find the proportion of wine and water in the resulting mixture.
[Reveal] Spoiler: Answer
19/81

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Sandy
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Intern
Joined: 05 Jan 2016
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Re: GRE Math Challenge #28-Mixture Problems [#permalink]  05 Jan 2016, 16:16
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hi
could u plz solve it:
Dr. Tik needs to make a solution that is 60% alcohol. if she has 4 liters of a solution that is 25% alcohol, how many of 80% solution will she need to add?
answer: 2.5 or 7 liters of 80%
Intern
Joined: 23 Jun 2017
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Kudos [?]: 5 [2] , given: 4

Re: GRE Math Challenge #28-Mixture Problems [#permalink]  01 Jul 2017, 11:36
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alime wrote:
hi
could u plz solve it:
Dr. Tik needs to make a solution that is 60% alcohol. if she has 4 liters of a solution that is 25% alcohol, how many of 80% solution will she need to add?
answer: 2.5 or 7 liters of 80%

7 liters is the correct answer.
Re: GRE Math Challenge #28-Mixture Problems   [#permalink] 01 Jul 2017, 11:36
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# GRE Math Challenge #28-Mixture Problems

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