SOLUTION: how many quarts of pure antifreeze must be added to 4 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?

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Question 704861: how many quarts of pure antifreeze must be added to 4 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Most of the work is to setup the equation; just one equation.
x= pure antifreeze to add.
%281.00%2Ax%2B40%2A0.10%29%2F%28x%2B40%29=0.30
%28x%2B4.0%29=0.30%28x%2B40%29
...more steps...