the perimeter of a rectangular field is 140m. If the length is increased by 15m and breadth is decrease by 5m, the length will become 3 times the breadth. Find the length of breadth of the field.

Answer 1

Let x=length; 70-x = breadth
(x + 15) =(3)*((70-x) - 5)
x + 15 = 3 * (65 - x)
x + 15 = 195 - 3x
4x = 180
x = 45
70 - x = 25