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23 August, 01:40

A tin can collecting money on a store counter for the holiday season contains $15.89 in quarters and dimes. if there are a total of 74 coins, how many of each coin are in the tin?

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  1. 23 August, 05:19
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    x=quarters y=dimes

    x+y=74

    .25x+.10y=15.89

    then substitute one equation into the next so ...

    y=74-x

    .25x+.10 (74-x) = 15.89

    .25x+7.4-.10x=15.89 then simplify

    .15x=8.49

    x=56.6 round up so 57 quarters

    to find y just plug in x so ...

    57+y=74

    y=17
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