The area of a rectangular wall of a barn is 320 square feet. Its length is 12 feet longer than twice its width. Find the length and width of the wall of the barn.

Answer 1

320 = W(W+12) = W^2 +12W

W^2 + 12W + 36 = 320 +36

W+6 = sqr356 = about 18.87

W = about 18.87-6 = 12.87 feet wide

L = 12+12.87 = 24.87 feet long

A=LW = 24.87(12.87) = about 320,08