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A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered.If the area of the field is 680 sq.ft, how many feet of fencing will be required ?

A. $84 f e e t$

B. $88 f e e t$

C. $85 f e e t$

D. $89 f e e t$

Correct Answer :

B. $88 f e e t$

We are given with length and area, so we can find the breadth.
as Length * Breadth = Area

\Rightarrow 20 * B r e a d t h = 680 \Rightarrow B r e a d t h = 34 f e e t A r e a t o b e f e n c e d = 2 B + L = 2 * 34 + 20 = 88 f e e t

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