math

Bob has 4 more dimes than nickels. He has 1.45 in all. How many nickels does he have? Please explain and show your work.

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  1. Let N be the number of nickels. Let D be the number of dimes.

    D - N = 4
    10D + 5N = 145 (the number of cents)

    Substitute N + 4 for D in the second equation and solve for N.

    10N + 40 +5N = 15N + 40 = 145
    15N = 105
    Take it from there.

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