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4 May, 20:08

Juan has 16 coins, all nickels and dimes. This collection of coins is worth $1. 15. How many nickels and dimes are there?

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  1. 4 May, 20:32
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    You would have 7 dimes and 9 nickels, this is because

    5n + 10d = 115 n + d = 16

    n = 23 - 10d n = 16 - d

    23 - 10d = 16 - d

    7 = 9d

    7/9 = d

    Therefore there is 7 dimes and 9 nickels
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