Monika, and others One real-life problem I give my students... I hired a contractor to redo my dirveway. He installed a drain box with 4"PVC pipe to carry rainwater to another part of my property. He was concerned about the large volume of water that could run down my driveway and had a special drainbox made with two 4" diameter exits. I asked him if he considered only one 6" drain pipe. He said that two 4" pipes would carry more. Was he correct? (It cost him more in labor and materials to install two pipes than one, and more to have a drainbox made with two holes. In what ways can a persons knowledge of math/geomwtry effect their ability to be successful?) Extensions: 1. What diameter pipe could be used to just equal (2) 4" pipes? 2. Suppose he considered two pipes of 6" diameter. What size should he use if he used onlyone pipe instead? 3. Is there a pattern here? How can you generalize you results?