SOLUTION: A tank at a marine exhibit contains 2000 gallons of sea water. The sea water is 7.5% salt. How many gallons, to the nearest gallon, of fresh water must be added to the tank so that

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Question 638985: A tank at a marine exhibit contains 2000 gallons of sea water. The sea water is 7.5% salt. How many gallons, to the nearest gallon, of fresh water must be added to the tank so that the mixture contains only 7% salt?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
A tank at a marine exhibit contains 2000 gallons of sea water.
The sea water is 7.5% salt.
How many gallons, to the nearest gallon, of fresh water must be added to the
tank so that the mixture contains only 7% salt?
:
Let x = amt of fresh water required to accomplish this
:
remember, the amt of salt stays the same only the per cent changes
:
.075(2000) = .07(x+2000)
150 = .07x + 140
150 - 140 = .07x
10 = .07x
x = 10/.07
x = 142.857 ~ 143 gallons of fresh water required.