Question

Question #00fa2

Answer 1

the width is 8

Explanation:

Let x be the requested width.

Then the length is `12+x` and the perimeter is `7x`.

There exists the relation:

(the perimeter is the sum of the sides, two times the width and two times the length)

`7x=2(12+x)+2x`

Let's solve the equation:

`7x=24+2x+2x`

`7x-2x-2x=24`

`3x=24`

`x=8`

Then the width is `8` and the length is `12+x=20`