SOLUTION: How many grams of salt must be added to 90 grams of a 20% salt solution to make a 25% salt solution?

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Question 858844: How many grams of salt must be added to 90 grams of a 20% salt solution to make a 25% salt solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
m = mass of salt to add.
%2890%2A20%2Bm%29%2F%28m%2B90%29=25;
Solve for m.