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19 July, 14:05

Yoon has a number of dimes and quarters she wants to put into rolls. She has 124 coins in all that add up to $20.50. If a roll of quarters is equal to ten dollars, how many extra quarters does she have that will not fill up a roll?

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  1. 19 July, 15:35
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    A) D + Q = 124

    B).10D +.25Q = 20.50

    Multiply B) by - 4

    B) -.40D + - Q = - 82.00 then add to A)

    A) D + Q = 124

    .60 D = 42

    D = 70 Dimes

    Q = 54 Quarters

    A roll of quarters = $10 = 40 Quarters so there will be 14 "extra" quarters.
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