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# A tank contains

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Senior Manager
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A tank contains [#permalink]

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13 Feb 2011, 02:03
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67% (01:11) correct 33% (00:00) wrong based on 3 sessions

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156) A tank contains 10,000 gallons of solution that is 5% sodium chloride by volume.if 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent of 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 [#permalink]

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13 Feb 2011, 04:21
10.000 -> 5% = 500 gallons

10.000 - 2.500 -> 7.500 gallons

500 gallons / 7500 gallons = 1/15 = 0,0667 = 6,67%
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03 Nov 2011, 10:33
Sodium chloride before evaporation: 0.05 * 10,000 = 500

After evaporation volume = 10000 - 2500 = 7500

Percent of sodium chloride after evaporation = 500 * 100/7500 = 20/3 = 6.666 %
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Re: A tank contains [#permalink]

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03 Nov 2011, 10:41
Correct, 50/750 is the answer.
Re: A tank contains   [#permalink] 03 Nov 2011, 10:41
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# A tank contains

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