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Question:

Amy wants to fence in a yard using 400 feet of fencing. If she wants the yard to be 30-feet wide, how long will it be?

A 170 feet
explanation

The formula used to determine the perimeter of a rectangle is P = 2(L + W). The width is 30, and the perimeter is 400. 400 = 2(L + 30).
400 = 2L + 60
340 = 2L
L = 170