Answer:
d=7
Step-by-step explanation:
To find d youll have to find it. 9d + 4 = 2d + 53 minus 2d on both sides> 7d+4=53 now minus 4 on both sides> 7d=49 divide 49/7 > d=7
Nickels = 112 * 3 / (3 + 4 + 7) = 24.