Question

the length of a rectangle is four times its bredth if the the perimeter of the rectnagle is 100 cm find it's length and breadth

Answer 1

So length is 4(10)= 40cm
Breadth is 10cm

Answer 2

Given that L=4b. Perimeter of rectangle = 2(L+b). 100=2(L+b). 50=(4b+b). 50=5b hence b=10 and put this value in L=4b you will get L=40