SOLUTION: Elizabeth had 3 times the number of quarters (25 cents) in her bag than dimes (10 cents). a. If she had a total of 72 coins, how many of them were quarters? b. What was the t

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Question 992579: Elizabeth had 3 times the number of quarters (25 cents) in her bag than dimes (10 cents).
a. If she had a total of 72 coins, how many of them were quarters?
b. What was the total dollar value of these coins?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
.
D=number of dimes; Q=number of quarters=3D; T=total value
.
D+Q=72
D+3D=72
4D=72
D=18
There were 18 dimes
Q=3D=3(18)=54
ANSWER (a): There were 54 quarters.
.
T=$0.10(D)+$0.25(Q)
T=$0.10(18)+$0.25(54)
T=$1.80+$13.50
T=$15.30
ANSWER (b): The value of the coins was $15.30