On Tue, 12 May 2015 19:18:22 -0400, Bill wrote:

A farmer has 20 feet of fencing and wishing to build a rectangular pen
against his barn (by adding 3 sides), maximizing the area. What should
the dimensions be? Note: It makes the kids smile if I include a little
animal in the diagram.

3x14 = 42
4x12 = 48
5x10 = 50
6x8 = 48
7x6 = 42

We have a winner!