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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
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B
80 m
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C
100 m
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D
120 m
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Solution

The correct option is A 40 m
Perimeter of a rectangle is 2×(l+b) where l and b are length and breadth of the rectangle respectively.
Perimeter = 2×(50+30)
= 2×(80)
= 160 m
Rohan needs 160 m of wire to fence the rectangular ground.
Thus, the length of wire left = (200-160) m = 40 m

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