Answer:
12 quarters, 16 nickels, 24 dimes
Step-by-step explanation:
Nickels = 4 + quarters
dimes = 2 * quarters
total $6.20 = 0.25quarters + 0.1 dimes + 0.05nickels
6.20 = 0.25q + 0.1d + 0.05n
6.20 = 0.25q + 0.1*(2q) + 0.05(4 + q)
6.2 = 0.25q + 0.2q + 0.2 + 0.05q
6.2 = 0.45q + 0.2 + 0.05q
6.2 = 0.5q + 0.2
6 = 0.5q
q = 12
12 quarters, 16 nickels, 24 dimes
