The perimeter of a building is 78 feet. The width of the building is seven more than three times the length of the building. What is the width of the building?

Question

I need help finding both the length and width of the building.

Answer 1

p = 2(l + w)

78 = 2(l + 3l + 7)

78/2 = [2(4l + 7)]/2

39 = 4l + 7

39 - 7 = 4l + 7 - 7

32 = 4l

32/4 = 4l/4

l = 8

w = 3(8) + 7 = 31