Question

the length of the rectangle is 4 more than its breadth area of the rectangle is 140 square CM calculate the length and the breadth

very urgent​

Answer 1

Answer:

Let the length be l and breadth be b

Original area of the rectangle=l*b

Given l=b+4

When the length is increased by 4cm,new length=l+4

When the breadth is decreased by 2 cm ,new breadth=b-2

(l+4)(b-2)=lb [given the area remains same]

lb-2l+4b-8=lb

-2l+4b=8 [lb get cancelled on both sides]

-l+2b=4 [dividing by 2}

-b-4+2b=4 [l=b+4 therefore -l=-(b+4)=-b-4]

b=8 cm

l=4+8=12 cm