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A tank contains 10,000 gallons of a solution that is 5

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A tank contains 10,000 gallons of a solution that is 5 [#permalink] New post 20 Dec 2012, 06:23
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A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

(A) 1.25%
(B) 3.75%
(C) 6.25%
(D) 6.67%
(E) 11.7%
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Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink] New post 20 Dec 2012, 06:25
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Walkabout wrote:
A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

(A) 1.25%
(B) 3.75%
(C) 6.25%
(D) 6.67%
(E) 11.7%


"The remaining solution will be approximately what percent sodium chloride?" means: what percent of the remaining solution is sodium chloride. Now, since the remaining solution is 10,000-2,500=7,500 gallons and sodium chloride is 500 gallons (5% of initial solution of 10,000 gallons) then sodium chloride is 500/7,500*100=~6.66% of the remaining solution of 7,500 gallons.

Answer: D.

Hope it's clear.
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Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink] New post 09 Mar 2013, 00:09
Walkabout wrote:
A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

(A) 1.25%
(B) 3.75%
(C) 6.25%
(D) 6.67%
(E) 11.7%


5% of 10,000 = 500.

required %age = 500 * 100/7500 = 6.67%
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Re: A tank contains 10,000 gallons of a solution that is 5   [#permalink] 09 Mar 2013, 00:09
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