The length of a rectangular field is thrice it's breadth. It's perimeter is 400 meters. Find its length and breadth

Answer 1

l = 3b

2(l + b) = 400 ----> l + b = 200

3b + b = 200

4b = 200

4b/4 = 200/4

b = 50

l = 3(50)

l = 150