Question

The perimeter of a rectangular plank is 120cm.if the length is 40cm find its breadth method 2l+b

Answer 1

Answer:

Step-by-step explanation:

2(l+b) = 120

2(40+b) = 120

40+b = 120/2

40+b = 60

Therefore, 'b' is 60-40 that is 20cm.

Answer 2

Answer:

Step-by-step explanation:

We know,

Perimeter of a rectangle= 2l+b

Here,

L=40cm

Therefore breadth=2*40*b=120

80b=120

b=120/80=15

Therefore b=15cm