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18 December, 16:55

John collected 150 nickels and dimes. He has 30 more nickels than dimes. How many of each does he have

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  1. 18 December, 17:02
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    n = d+30 since he has 30 more nickels than dimes, to make them equal you have to add 30 to the dimes.

    :

    n+d = 150 substitute for n:

    d+30+d = 150

    2d = 120

    d = 60 he has 60 dimes and 150-60 = 90 nickels
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