d + q = 21 ----> d = 21 - q
10d + 25q = 420
10(21 - q) + 25q = 420
210 - 10q + 25q = 420
15q = 210
q = 14
d = 21 - 14
d = 7
Jamarcus has twenty-one coins in his piggy bank, all of which are either dimes or quarters. If Jamarcus has $4.20 in total, how many of each coin does he have?
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