SOLUTION: How many quarts of a 50% acid solution must be added to 20 quarts of a 20% acid solution to obtain a 40% acid solution?

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Question 425150: How many quarts of a 50% acid solution must be added to 20 quarts of a 20% acid solution to obtain a 40% acid solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.50m+20(.2)=.4(m+20)
.50m+4=.4m+8
.1m=4
m=4/.1=40
You need 40 qts. of 50% acid solution for your mix..