Question 339343
let width be w
length = 2w+3
..
Perimeter = 2*(w+2w+3)
Perimeter = 2*(3w+3)
Perimeter = 6w+6
...
6w+6=90
add -6
6w+6-6=90-6
6w=84
divide by 6
w = 84/6
w= 14 cm. width
length = 2w+3
= 2*14+3
= 31 cm length