Juan needs to run extension cords 18 1 feet. He has one extension cord that
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is 6 1 feet and a second extension cord that is 7 1 feet.
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If Juan only gets one more extension cord, what is the minimum length that it must be?
Since Juan needs to run 18 feet of extension cords and already has a 6 foot and a 7 foot extension cord, he already has a total of 13 feet of extension cords.
Therefore, the minimum length of the third extension cord must be 5 feet in order to reach a total of 18 feet.