Question #00fa2

1 Answer
Oct 8, 2017

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