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16 September, 12:49

A piggy bank contains $5.60 in nickels and dimes. the number of nickels is 8 less than 3 times the dimes. how many nickels and dimes are there in the piggy bank?

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  1. 16 September, 12:59
    0
    10d+5n=560 and n=3d-8, using this n in the first equation gives you:

    10d+5 (3d-8) = 560

    10d+15d-40=560

    25d-40=560

    25d=600

    d=24, and since n=3d-8

    n=3 (24) - 8

    n=72-8

    n=64

    So there are 24 dimes and 64 nickels in the piggy bank.
  2. 16 September, 15:48
    0
    1.50 cent because you subtracted
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