SOLUTION: how much water must evaporate to change 50 pounds of a 5% salt solution to an 8% salt solution?

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Question 383854: how much water must evaporate to change 50 pounds of a 5% salt solution to an 8% salt solution?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.05*50 - 0*x = 0.08*(50 - x);
2.5 = 4 - 0.08x;
0.08x = 1.5;
x = 18.75 lbs, the amount of water that must be evaporated.