The length of a rectangle is 4 times its width and the perimeter is 150 feet.
what is the width of the rectangle?
a.
75 feet
b.
30 feet
c.
15 feet
d.
60 feet

We know that L = 4W, and P = 2l + 2w, so 150 = 2L + 2w
So, 150 = 2*4w + 2w
      150 = 8w + 2w
      150 = 10w
       w = 150/10
       w=15
So, the Width of the Rectangle is 15 feet.
And if they asked you to find the length,
 L = 4W
L = 4*15
L=60 
so, the Length will be 60 feet.

Hope this Helps! :)