The length of a rectangle is 11cm more than the width.The perimeter is 90cm.Find the dimensions.

Question

Please help I don't understand!

Answer 1

Let w = the width

Let w + 11 = the length

P = 2l + 2w

90 = 2(w+11) + 2w

90 = 2w + 22 + 2w

68 = 4w

17 cm = w

w + 11 = 17 + 11 = 28

length = 28 cm