SOLUTION: i have eight more quarters than dimes.if the coins are worth 6.20 how many dimes are there?

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Question 105489This question is from textbook
: i have eight more quarters than dimes.if the coins are worth 6.20 how many dimes are there? This question is from textbook

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
Q=D+8
.10D+.25(D+8)=6.20
.10D+.25D+2=6.20
.35D=6.20-2
.35D=4.2
D=4.20/.35
D=12 NUMBER OF DIMES
Q=12+8=20 QUARTERS
PROOF
.10*12+.25*20=6.20
1.20+5.00=6.20
6.20=6.20