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23 March, 18:09

A money box contains only 10-cent and 20-cent coins. There are 34 coins with a total value of $5.40. How many coins of each

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  1. 23 March, 18:32
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    10x+20y=540

    x+y=34

    y=34-x

    Plug in (34-x) for y:

    10x+20 (34-x) = 540

    10x+680-20x=540

    -10x=-140

    10x=140

    x=14

    There were 14 ten cent coins and 20 20 cent coins
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