SOLUTION: how many quarts of pure antifreeze must be added to 2 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?

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Question 548177: how many quarts of pure antifreeze must be added to 2 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
--------percent ---------------- quantity
Antifreeze I 20 ---------------- 2 quarts
Pure 100 ---------------- x quarts
Mixture 50 ---------------- 2 + x quarts

20*2+100x=50(2+ x)
40+100x =100+50x
100x+-50x=100- -40
50x=60
/ 50
x = 1.2
1.2 quarts of Pure