How many quarts of pure antifreeze must be added to 7 quarts of 40% antifreeze solution to obtain a 50% antifreeze solution?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter7: Applying Fractions
Section: Chapter Questions
Problem 38CLR
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How many quarts of pure antifreeze must be added to 7 quarts of 40% antifreeze solution to obtain a 50% antifreeze solution? 

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