SOLUTION: How many quarts of pure antifreeze should Frida add to 10 quarts of a 20% antifreeze solution to make a 50% antifreeze solution?

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Question 107585: How many quarts of pure antifreeze should Frida add to 10 quarts of a 20% antifreeze solution to make a 50% antifreeze solution?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
X+10*.2=(X+10).5
X+2=.5X+5
X-.5X=5-2
.5X=3
X=3/.5
X=6 ANSWER FOR THE AMOUNT OF PURE ANTIFREEZE NEEDED.
PROOF
6+2=16*.5
8=8