SOLUTION: A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?

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Question 382640: A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
400*0.25 + x*1.00 = (400 + x)*0.40;
100 + x = 160 + 0.40x;
0.60x = 60;
x = 100 grams, the amount of salt that must be added.