Question

An automobile's radiator has a capacity of fifteen quarts, and it currently contains twelve quarts of a thirty percent antifreeze solution. How many quarts of pure antifreeze must be added to strengthen the solution to forty percent?

Answer 1

2 quarts is your answer

(I had the same question)

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Answer 2

[12(.3)+x(1)]/(12+x)=.4

3.6+x=4.8+.4x

.6x=1.2

x=2 qts

(though your radiator would still be short a quart for doing so :) )