Question

Rohan wants to fence a rectangular ground with length 50 m and breadth 30m with a wire. If he has a 200 m wire with him, how much of the wire will be left with him after fencing?

• A. 40 m
• B. 80 m
• C. 100 m
• D. 120 m

Answer 1

The correct option is A 40 m

Perimeter of a rectangle is $2\times (l+b)$ where $l$ and $b$ are length and breadth of the rectangle respectively.
$\therefore$Perimeter = $2\times (50+30)$
= $2\times \left(80\right)$
= 160 m
Rohan needs 160 m of wire to fence the rectangular ground.
Thus, the length of wire left = (200-160) m = 40 m