Question 695619
Q+D=36
Q=36-D
.25Q+.10D=6.75
.25(36-D)+.10D=6.75
9.00-.25D+.10D=6.75
-.15D=6.75-9.00
-.15D=-2.25
D=-2.25/-.15
D=15  NUMBER OF DIMES.
Q=36-15=21 NUMBER OF QUARTERS.
PROOF:
.25*21+.10*15=6.75
5.25+1.50=6.75
6.75=6.75