A coin bank contains $3.20.There are twice as many nickels as quarters and half as many dimes as quarters.How many nickels are there in the coin bank?
+1005 Lets say there are q quarters.
There are 2q nickels, and q/2 dimes.
2q * 0.05 + (q/2)0.1 + 0.25q = 3.2
0.1q + 0.05q + 0.25q = 0.4q = 3.2
q = 3.2/0.4 = 32/4 = 8
8 quarters, 16 nickels, 4 dimes
8*0.25 = 2, 16*0.05 = 0.8, 4*0.1 = 0.4, correct!
