Answer:
466,56 inches
Step-by-step explanation:
1 yard = 36 inches
1 cubic yard = 36*36*36 = 46656 cubic inches
46656 = 20*5*l => l = 46656/100 = 466, 56 inches
A caucluation he can use is adding, just add 7422 and 5570 and you should get your answer.
centroid
Definition of a centroid