SOLUTION: A car radiator contains 3 quarts of 30% antifreeze. How much 70% antifreeze must be added to produce a mixture of 55% antifreeze?

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Question 775566: A car radiator contains 3 quarts of 30% antifreeze. How much 70% antifreeze must be added to produce a mixture of 55% antifreeze?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
H = 70%
L = 30%
T = 55%
U = 3 quarts of the 30%
v = unknown quarts volume of the 70%

highlight%28%28LU%2BHv%29%2F%28U%2Bv%29=T%29
Solve for v.