SOLUTION: 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
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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%? Found 2 solutions by josgarithmetic, MathTherapy:Answer by josgarithmetic(39617) (Show Source):
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Seawater has about 3.5% "salinity", largely of sodium chloride. What density is given for your "7.5%" salt seawater? For the world's seawater at 3.5% salinity, it is 1.025 grams/ml.
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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%?
Let amount of water to be added be W
Then: .925(2000) + W = .93(2000 + W)
1850 + W = 1860 + .93W
W - .93W = 1860 - 1850
.07W = 10
Amount of water to add = , or 142.8571429 ≈ gallons
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