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

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Question 28294: How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to get a 40% solution of acid?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
50x+20(20)=40(x+20)
50x+400=40x+800
10x=400
x=40

Hence, about 40 quarts of solution muct be added.
Paul.