SOLUTION: a Collection of 40 dimes and nickels is worth $2.90. How mkany nickels are ther?

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Question 354687: a Collection of 40 dimes and nickels is worth $2.90. How mkany nickels are ther?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
Let n be the number of nickels. then (40-n) will be the number of dimes.
.
question states**
10(40-n) + 5n = 290
.
simplify and solve
400-10n + 5n = 290
.
-5n = -110
.
n = 22 the number of nickels
.
check your answer
10*18 + 5*22 = 290