Question

The length of a rectangle is 5 centimeters less than twice its width. The perimeter of the rectangle is 80 cm. What are the dimensions of the rectangle?

Answer 1

`15`cm x `25` cm

Explanation:

If `x` is the width `w`, then the length `l` is `2x-5`

The perimeter `p = 2w+2l`

So

`80 = 2x+2(2x-5)`
`80 = 6x - 10`
`6x = 90`

`:. x = 15`

The length is `2*15-5 = 25`