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How much water (in grams) should be added to the

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How much water (in grams) should be added to the [#permalink] New post 04 Nov 2007, 20:28
How much water (in grams) should be added to the 35%-solution of acid to obtain the 10%-solution?

(1) There are 50 grams of the 35%-solution
(2) In the 35%-solution the ratio of acid to water is 7:13

Please explain your answers. Thanks.

Last edited by eyunni on 05 Nov 2007, 07:13, edited 1 time in total.
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Re: Challenge 09, Q18 [#permalink] New post 05 Nov 2007, 07:13
GMAT TIGER wrote:
eyunni wrote:
How much water (in grams) should be added to the 35%-solution of acid to obtain the 10%-solution?

(1) There are 50 grams of the 35%-solution
(2) In the 35%-solution the ratio of acid to water is 7:13


A


7:13 is the ratio of weight or volume?
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 [#permalink] New post 05 Nov 2007, 07:35
A

1. There is 50 grams of 35% solution. Therefore there is 17.5 grams of acid. to make this 10% acid solution 175-17.5 = 157.5 grams of water should be added.

2. Statement 2 says the same thing twice. 35% solution and ratio of acid to water is 7 : 13 is the same thing i.e ratio of acid to total solution is 7 : 20 = 35%
  [#permalink] 05 Nov 2007, 07:35
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