Project on geometry in real life?

I work with asphalt, paving roads. We have to figure out how mush asphalt it will take to pave or resurface a road. We do this based on the length, width and how thick we are going to put it down. With a known weight per square yard we can figure out how many tons of asphalt we will need for a given road. We also use this in reverse to check how much asphalt we are putting down per square yard as we go along.