If the perimeter of rectangle is 120 cm and it's length is 40 cm. Find the breadth of rectangle?

Given: 

Perimeter of the rectangle = 120 cm

Length of the rectangle = 40 cm

To find: Here we have to find the breadth of the rectangle.

Solution:

We know that;

2 $\times$ (Length of the rectangle $+$ Breadth of the rectangle) = Perimeter of rectangle

Perimeter and length of the rectangle are already given. So, 

2 $\times$ (40 $+$ Breadth of the rectangle) = 120 cm

40 $+$ Breadth of the rectangle = $\frac{120}{2}$ cm

40 $+$ Breadth of the rectangle = 60 cm

Breadth of the rectangle = 60 $-$ 40 cm

Breadth of the rectangle = 20 cm

So, breadth of the rectangle is 20 cm.