Question 773556
D+Q=30
.1D+.25Q=5.7 (m by 20)

D+Q=30 
2D+5Q=114


D+Q=30 (m by -2)
2D+5Q=114

-2D-2Q=-60
2D+5Q=114


adding...

3Q=54
Q=18

D=30-18=12

12 dimes, 18 quarters