SOLUTION: How many gallons of pure water must be added to 10 gallons of 30% saltwater to make a solution that is 25% saltwater?"

Question 366644: How many gallons of pure water must be added to 10 gallons of 30% saltwater to make a solution that is 25% saltwater?"
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
let x = # gallons pure water that must be added. Then
10*0.30 + x*0.00 = (10 + x)0.25,
3 = 2.5 + 0.25x,
0.5 = 0.25x
x = 2 gallons of water must be added.
***Note: x*0.00 denotes the weight contribution of the water to the salt content of the newly mixed solution. x is in gallons, and its salt concentration is 0.00 weight units per gallon, so that x*0.00 is in weight units.***
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