Question

area of a rectangle is increased by 20 units it is its length is increased by 8unit and breadth decreased by 1 unit if we increase its its breadth by 2 units and decrease if the length by 4 unit area decreases by 4 units find perimeter​

Answer 1

Step-by-step explanation:

let length be x units

breadth = y units

area = xy

now

new length = x +8

breadth = y - 1

area = xy + 20

area = (x + 8)(y - 1)

xy +20 = (x+8)(y-1) eq -1

new length = x - 4

breadth = y + 2

area = xy - 4

area = length×breadth

xy - 4 = (x-4)(y+2)

on solving we get

x = 17,y = 5