Question

the perimeter of a rectangle is 13cm and its width 2whole3/4cm.find it's lenght in cm​

Answer 1

As we know,perimeter of rectangle=2× (l+b)

Therefore, 2×(2 3/4+b)

Now again as we know, perimeter=13cm

Therefore,2 (2 3/4+b)=13

2(11/4+b)=13

11/4+b=13/2

b=13/2-11/4

b=13×2/2×2-11/4

b=26/4-11/4

b=15/4cm

Hope it helps you..