SOLUTION: a purse contains $1.15 in nickels and dimes and has 20 coins. How many dimes are n the purse?

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Question 626158: a purse contains $1.15 in nickels and dimes and has 20 coins. How many dimes are n the purse?
Answer by nerdybill(7384) About Me  (Show Source):
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a purse contains $1.15 in nickels and dimes and has 20 coins. How many dimes are n the purse?
.
Let d = number of dimes
then
20-d = number of nickels
.
.05(20-d) + .10d = 1.15
1-.05d + .10d = 1.15
1+.05d = 1.15
.05d = .15
d = .15/.05
d = 3 (answer)