Question 115884
q+d=80 or d=80-q
.25q+.10d=11
.25q+.10(80-q)=11
.25q+8-.10q=11
.15q=11-8
.15q=3
q=3/.15
q=20 number of quarters.
80-20=60 number of dimes.
proof
.25*20+.10*60=11
5+6=11
11=11