Asked by Danielle

How do I figure how many of each coin I have if I have $1.60 - some are quarters and some are dimes and I have 10 coins total.
Answered by Steve
if there are d dimes, then the rest q=(10-d) are quarters. So, adding up the values,

10d + 25q = 10d + 25(10-d) = 160
d=6, so q=4
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