Question

The length of a rectangle is 3 cm greater than its width. The perimeter is 24 cm. Find the dimensions of the rectangle. 3 cm, 9 cm 4.5 cm, 7.5 cm 7.5 cm, 10.5 cm 10.5 cm, 13.5 cm

Answer 1

Length (L): w + 3

width (w): w

Perimeter (P) = 2L + 2w

                24 = 2(w + 3) + 2(w)

                24 = 2w + 6 + 2w

                24 = 4w + 6

                18 = 4w

                18/4 = w

                9/2 = w

                4.5 = w

Length (L): w + 3   = 4.5 + 3   = 7.5

Answer: width = 4.5 cm, length = 7.5 cm