easy one

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magical cook: Master | Next Rank: 500 Posts; Posts: 484; Joined: Sun Jul 30, 2006 7:01 pmFollowed by: 1 member; Thanked: 2 times

by magical cook » Mon Jan 28, 2008 9:43 am

How many liters of an acid solution with no salt content should be mixed with 35 liters of a saline solution with 40% salt content to yield a 32% saline solution?

(A) 4.12
(B) 8.75
(C) 18
(D) 35
(E) 43.75

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Source: Beat The GMAT — Problem Solving | Mon Jan 28, 2008 9:43 am

roy_priya: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Tue Jan 08, 2008 12:47 pm; Thanked: 1 times

by roy_priya » Mon Jan 28, 2008 3:09 pm

35 L has a saline concentration of 40%. To get to a concentration of 32% it has to be diluted to 43.75 L (inverse relationship).

So 8.75L needs to be added.

Answer is B

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magical cook: Master | Next Rank: 500 Posts; Posts: 484; Joined: Sun Jul 30, 2006 7:01 pmFollowed by: 1 member; Thanked: 2 times

by magical cook » Mon Jan 28, 2008 3:35 pm

thanks - no OA but I got the same answer.

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