Question

You have 40 coins that are made up of nickels and quarters. The value of the coins is $6.60. Find the number of nickels and quarters

Answer 1

n and q are the number of nickels and quarters, respectively.
n+q = 40
n = 40-q

0.05n + 0.25q = 6.60
0.05(40-q) + 0.25q = 6.60
2-0.05q + 0.25q = 6.60
0.20q = 4.60
q = 23
n = 40-q = 17

23 quarters and 17 nickels

Answer 2

22 quarters and 18 nickels.

Explanation: