07-07-2017
Mathematics

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Debi had $1.55 in a collection of dimes and nickels. The number of nickels is seven more than the number of dimes. Find the number of each type of coin.

There are _ dimes.
There are _ nickels.

Respuesta :

musiclover10045 musiclover10045

17-07-2017

N =D+7

0.10D +0.05(D+7) = 1.55

0.15D +0.35 = 1.55

0.15D=1.20

D=120/0.15 = 8

8x0.10 = 0.80

1.55-0.80= 0.75

8+7=15 * 0.05 = 0.75

8 dimes and 15 nickels

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