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A tank contains 10,000 gallons of a solution that is 5 [#permalink]
20 Dec 2012, 05:23

00:00

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Difficulty:

25% (low)

Question Stats:

79% (02:01) correct
20% (01:32) wrong based on 145 sessions

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?

Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink]
20 Dec 2012, 05:25

2

This post received KUDOS

Expert's post

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.

Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink]
08 Mar 2013, 23:09

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?

Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink]
30 Jun 2013, 20:12

I have a question.

Are we supposed to assume none of the sodium chloride was evaporated from the same original 10000 Gallons.

Hence of the 500 Gallons of original Sodium Chloride wouldn't the amount of sodium chloride in the solution also decrease by the same rate as the solution without Sodium Chloride?
_________________

Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink]
30 Jun 2013, 21:30

Expert's post

hfbamafan wrote:

I have a question.

Are we supposed to assume none of the sodium chloride was evaporated from the same original 10000 Gallons.

Hence of the 500 Gallons of original Sodium Chloride wouldn't the amount of sodium chloride in the solution also decrease by the same rate as the solution without Sodium Chloride?

We are told that from 10,000 gallons of a solution, evaporated 2,500 gallons of water. So, salt did not evaporate.

If it were the way you suggest (if salt evaporated at the same rate as the water) then the answer would simply be 5%.
_________________

Re: A tank contains 10,000 gallons of a solution that is 5 [#permalink]
30 Jun 2013, 21:51

Bunuel wrote:

hfbamafan wrote:

I have a question.

Are we supposed to assume none of the sodium chloride was evaporated from the same original 10000 Gallons.

Hence of the 500 Gallons of original Sodium Chloride wouldn't the amount of sodium chloride in the solution also decrease by the same rate as the solution without Sodium Chloride?

We are told that from 10,000 gallons of a solution, evaporated 2,500 gallons of water. So, salt did not evaporate.

If it were the way you suggest (if salt evaporated at the same rate as the water) then the answer would simply be 5%.

Ok, I assumed that the two solutions were mixed in the same container.

Thank you Bunuel
_________________

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Re: A tank contains 10,000 gallons of a solution that is 5
[#permalink]
30 Jun 2013, 21:51