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# A tank contains 10,000 gallons of solution that is 5% sodium

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A tank contains 10,000 gallons of solution that is 5% sodium [#permalink]  26 Oct 2003, 00:37
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A tank contains 10,000 gallons of solution that is 5% sodium chloride in volume. if 2,500 gallons of water evaporated from the tank, the remaining solution will be what percent of the sodium choride.
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BEFORE there are 9500 g of water and 500 g of the chemical.
AFTER there are 7000 g of water and 500 g of chemical.

500*100%/7500=500/75=20/3=6 and 2/3 %.
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