You can 
put this solution on YOUR website! .
length of rectangle is 6m less than three times the breadth. If its 
 perimeter is 148 m find dimension of the rectangle
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L = 3W - 6
L + W + L + w = 148 (perimeter !)  --->
(3W-6) + W + (3W-6) + W = 148,  --->
8W - 12 = 148  --->  8W = 160  --->  W = 
 = 20.
The width is 20 m.
Then the length is 3W -6 = 3*20-6 = 54 m.