SOLUTION: if one has $11.00 in quarters and dimes with total of 80 coins, how many dimes does he have?

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Question 115884:
if one has $11.00 in quarters and dimes with total of 80 coins, how many dimes does he have?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
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