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30 May, 20:26

Christina decided to make a pen for her dog that is 6 feet wide and 11 feet long. However, after looking at the place where she wanted to put the pen, she decided the width should instead measure only 3 feet. If she wants the perimeter of the pen to stay the same, what will be the new length of the pen?

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  1. 30 May, 20:45
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    14 ft

    Step-by-step explanation:

    The perimeter of the pen Christina first decide to make is;

    Perimeter = L + L + W + W

    = 6 ft + 6 ft + 11 ft + 11 ft

    =34 feet

    Now she wants the width to be only 3 ft and the perimeter to be the same.

    34 ft = L + L + 3 ft + 3 ft

    34 ft = 2L + 6 ft

    subtract 6 ft from both sides of the equation to give you;

    28 ft = 2L

    Divide both sides of the equation by 2 to give you;

    L = 14 ft
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