First, let's see how much sand the truck can carry in one trip. We do this by finding the volume of the bed. We do this by multiplying the length*width*height. This is equal to 8*5*3 = 120 cubic feet.
Now, we divide 300 by 120 to see how many trips the truck will need to make. This is equal to 2.5. Because the truck can not make half a trip, the truck will need to make 3 trips.
