document.write( "Question 892841: A tank at a marine exhibit contains 2000 gallons of seawater. The seawater is 7.5% salt. How many gallons to the nearest gallon of fresh water must be added to the tank so that the mixture only contains 7%? \n" ); document.write( "

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\n" ); document.write( "A tank at a marine exhibit contains 2000 gallons of seawater. The seawater is 7.5% salt. How many gallons to the nearest gallon of fresh water must be added to the tank so that the mixture only contains 7%?
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document.write( "Let amount of water to be added be W
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document.write( "Then: .925(2000) + W = .93(2000 + W)
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document.write( "1850 + W = 1860 + .93W
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document.write( "W - .93W = 1860 - 1850
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document.write( ".07W = 10
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document.write( "Amount of water to add = , or 142.8571429 ≈  gallons \n" );
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