The length of a rectangle is 5mm more than twice the width. if the area is 168 square mm, fine the dimensions of the rectangle.

Question

Mathematics

Slade Hunt

30 October, 12:19

The length of a rectangle is 5mm more than twice the width. if the area is 168 square mm, fine the dimensions of the rectangle.

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Answers (1)

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Morgan Serrano · Answer 1

Let the width be w and length be l and area be a.

l = 5 + 2w

now, area = length x breadth

=> a = l x b

=> 168 = (5+2w) x w

=>168 = 5w + 2w^2

=>on factorising, w = 8

hence dimensions : 21 x 8 mm