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John and Dave are building a rectangular pen next to the barn for their goat, Ginny. They plan to use one 60-foot wall of the barn as part of the pen, so they only need to build the remaining three sides. They want the width of the pen to be half of the length. How much fencing will they need to complete Ginny’s pen? Can you find more than one answer?

Look at the two pens drawn below.
Which one correctly illustrates the problem?
Use this information to solve the problem, but remember one side of the drawing is the barn and will not need fencing.

2 rectangles representing 2 barns: Left barn: 60 feet by 120 feet. Right barn: 60 feet by 30 feet.