Math

A girl had 20 coins in nickels and dimes whose Sun was $1.40. She spent 65¢ using 8 coins. She has __ nickels.

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  1. 5n+10(8-n) = 65
    -5n = -15
    n = 3

    she spent 3 nickels and 5 dimes.

    So, starting with N nickels and D dimes,

    5N+10(20-N) = 140
    -5N = -60
    N=12

    So, she is left with 9 nickels.

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