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Question

Olivia bought 40 m wire for fencing her own rectangular field of length 9 m and width 7 m. How much wire is left with her?

A
4 m
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B
8 m
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C
12 m
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D
14 m
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Solution

The correct option is B 8 m
Wire required to fence the field
= Perimeter of the field
=2×(Length + Width)
(Perimeter of rectangle = 2× (Length + Width))
=2×(9+7)
=2×16
=32 m

Wire left = Total wire - Wire used
=4032=8 m

Therefore, wire left with Olivia = 8 m, (b) is the correct option.

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