$12.35
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4 Qs 12 Dimes 20 Nickles
d = q + 3; 10d + 25q = 345. 10(q + 3) + 25q = 345 ie 35q = 315 so q = 9 and d = 12. Check: 9 quarters = $2.25, 12 dimes = $1.20, total $3.45.QED
$3.45 $1.00 = 4 quarters $2.00 = 8 quarters $3.00 = 12 quarters $3.00 + $0.25 + $0.10 + $0.10
Zero. The maching gives change in quarters and dimes not nickles.
12 quarters,7 dimes, and 3 nickels