SOLUTION: How many quarts of a 55% acid solution must be mixed with 8 quarts of a 30% acid solution to produce a 45% acid solution?

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Question 459513: How many quarts of a 55% acid solution must be mixed with 8 quarts of a 30% acid solution to produce a 45% acid solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.55x+.30(8)=.45(x+8)
.55x+2.4=.45x+3.6
.1x=1.2
x=1.2/.1=12
You need 12 quarts of 55% solution..