A neighbor of mine has a lawn that isn't looking too good. He has decided to remove all the old sod
(grass), bring in a new 4 inch layer of topsoil, install new in-ground sprinklers, and reseed the lawn.
He seems to think that he'll be able to save money by hauling loads of topsoil from the store himself
in his pickup truck, rather than paying for delivery, but I don't think he's right. You're going to help
us settle this.

1) Make an educated guess of how many pickup truck loads of topsoil my neighbor would need.