A rectangular field is to be fenced on three sides leaving a side of 20 m uncovered. If the area of the field is 680 $m^2$ ,how many meters of fencing will be required?

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Given, The area 
of the rectangular 
field $$\begin{gathered} =680 m^2 \\ The Leagth of the \\ rec\tan gular =\frac{680}{20} m \\ =34 m \\ Three sides meters of fencing \\ will be required = (34+20+34) m \\ =88 m \end{gathered}$$