Question

The perimeter of a rectangle is 120 m, if the breadth of the rectangle is 20 m, then its length =

• A. 20 m
• B. 30 m
• C. 40 m
• D. 50 m

Answer 1

The correct option is C 40 m

Let the length and breadth of the rectangle be 'l' and 'b' meters respectively.
Perimeter = 2 (l + b).
Given, perimeter = 120 m
Therefore 2 (l + b) = 120
Hence, (l + b) = 60 m.
Given, b = 20 m
Therefore, l = 60 - b
l = 60 - 20
l = 40 m