First we should find the total volume of the dirt that must be evacuated:
[tex] 30yd*15yd*3yd=1350yd^{3} [/tex]
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):
[tex] \frac{1350yd^{3}}{3yd^{3}}=450 [/tex]
So now we know that it will take 450 trips to complete the dirt evacuation.
