The perimeter of a rectangle is 24 meters and it’s length is 3 times the width. what is the length and width of the rectangle

Length is 9meters and width is 3 meters

steps:
let's assume width of a rectangle = a meters
than length of the rectangle = 3*a= 3a
perimeter = 24 meters
formula to find perimeter: p = 2(l+w)
substitute the values of in the formula
24 = 2 (3a+a)
24 = 2(4a)
24 = 8a
24/8= a
3= a
a is width of the rectangle = 3 meters
length of the rectangle = 3* a = 3*3= 9 meters
hence and is length 9 meters and width 3 meters

Set square i think so