Respuesta :

Dark3256

Step-by-step explanation:

Length is three times 5 less than width so,

Let width be =x

And let lenght be = x-3*5

Perimeter=2*(l+b)

2*(x-3*5+x)=150

2*(x-15+x)=150

(expand)

2x-30+2x=150

4x=150+30

4x=180

x=180/4

x=45

Lenght=x-3*5

45-15=30

Checking,

2(45+30)

2*75=150

Hope it helps