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Toby has 15 coins totaling $2.85. He has only quarters and dimes. How many of each type coin does he have?
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3 votes
Toby has 15 coins totaling $2.85. He has only quarters and dimes. How many of each type coin does he have?

User Bernhardw
by
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1 Answer

3 votes
q + d = 15
.25q + .1d = 2.85

q = 15 - d

.25(15-d) + .1d = 2.85
3.75 - .25d + .1d = 2.85
3.75 - .15d = 2.85
-.15d = -.9
d = 6

q = 15 - d
q = 15 - 6
q = 9

9 quarters, 6 dimes.
User Nefzen
by
7.6k points
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