Question

The length of a rectangular field is 3 times its breadth if the perimeter of the rectangle is 56 m Find its length and breadth

Answer 1

let b be x
l be 3x
now p=2(l+b)
a/c
2(x+3x)=56
2*4x=56
x =56/8
x=7
now b =7
l=21

Answer 2

3l= b
perimeter= 2(l+b)
56= 2(l+3l)
28= 4l
l=7
b=21