The length of a rectangular label is 2.5 cm less than twice the width. the perimeter is 40.6 cm. find the width.

Let the width be w, then the length is 2w - 2.5.

Perimeter = 2 (length + width)

40.6 = 2 (2w - 2.5 + w) = 2 (3w - 2.5)

3w - 2.5 = 40.6/2 = 20.3

3w = 20.3 + 2.5 = 22.8

w = 22.8/3 = 7.6

Therefore, width is 7.6 cm.