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    HeatherG's Avatar
    HeatherG Posts: 2, Reputation: 1
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    #1

    Jun 3, 2010, 10:07 PM
    How many quarts of pure antifreeze must be added to 9 quarts of a 10% antifreeze solu
    How many quarts of pure antifreeze must be adddd to 9 quarts of a 10% antifreeze solution to obtain a 20% antifreeze solution?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 4, 2010, 03:59 AM

    Let x be the amount of pure antifreeze to be added.

    If we add this to the 9 quarts, how much do we have? 9+x quarts. We are told this must be 20%.

    So, we have



    Solve for x.
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