Answer:
200 bags needed
Step-by-step explanation:
Find the volume of one such box and then multiply the result by 4 to obtain the total volume of the dirt needed to fill them:
V = (10 ft)(5 ft)(1.5 ft) = 75 ft^3
There are four such boxes, so the total amount of dirt needed to fill them all is
4(75 ft^3) = 300 ft^3
Dividing this by 1.5 ft^3/bag, we get:
200 bags needed