Deangelo has $7 worth of dimes and quarters in a jar. He has 7 more quarters than dimes.
How many of each coin does he have?
Enter your answers in the boxes.
dimes and
quarters
14 dimes and 21 quarters
.10 d + .25 q = 7
q = (d+7)
.1 d + .25 (d+7) = 7
.35 d + .25*7 = 7
.35 d = .75*7
d = 15
q = 22
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check
.1*15 + .25*22 = 1.5 + 5.5 = 7 sure enough