SOLUTION: how many quarts of a 20% salt solution must a chemist mix with a 40% to make 40 quarts of a 25% salt solution?

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Question 1027839: how many quarts of a 20% salt solution must a chemist mix with a 40% to make 40 quarts of a 25% salt solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how many quarts of a 20% salt solution must a chemist mix with a 40% to make 40 quarts of a 25% salt solution?
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t = amount of 20%
f = amount of 40%
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t + f = 40 --- (total solution)
20t + 40f = 25*(t+f) --- (total salt)