Question

The total value of nickels and dimes in a coin bank is $5.15. There are 8 more dimes than nickels in the bank. How many dimes are in the bank?

Answer 1

0.05n + 0.1d = 5.15
n = d - 8

0.05(d - 8) + 0.1d = 5.15
0.05d - 0.4 + 0.1d = 5.15
0.15d = 5.55
d = 37

Check:
0.05(29)+ 0.1(37)= 5.15
1.45 + 3.70 = 5.15
5.15 = 5.15 :)