Question

A rectangle shed is fenced with 120ft long barbed wire. If length of the shed is twice as long as the width, that is the length?

Answer 1

40 ft

Explanation:

Data:

(1) P = 120 ft

(2) l = 2w

Calculations:

(3) P = 2l + 2w Substitute (1) and (2) into (3)

120 = 2(2w) + 2w Multiply

120 = 4w +2w Combine like terms

120 = 6w Divide by 6

(4) w = 20 ft Substitute (4) into (2)

l = 2 × 20

l = 40 ft

Check:

120 = 2×40 + 2×20

120 = 80 + 40

120 = 120