Question 157614
Shannon had five times as many quarters as dimes in her jar. if the total value of the dimes and quarters are equal $16.20, how many of each kind of coin did she have in the jar? 
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Let d = number of dimes in her jar
then from "Shannon had five times as many quarters as dimes" we get
5d = number of quarters in her jar
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Because the total is $16.20 we get our equation:
.10d + .25(5d) = 16.20
.10d + 1.25d = 16.20
1.35d = 16.20
d = 16.20/1.35
d = 12  (number of dimes)
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5d = 5*12) = 60 (number of quarters)