Dirt must be evacuated for the foundation of the building 30 yards by 15 yards to a depth of 3 yards. how many trips will it take to haul the dirt away if a truck with the capacity of 3 cubic yard is use

First we should find the total volume of the dirt that must be evacuated:

Then we are told that the truck's capacity is 3 cubic yards. So then we must divide this total amount of dirt that must be evacuated and divide by 3 (the hauling capacity of the truck):

So now we know that it will take 450 trips to complete the dirt evacuation.