[88] A rectangular field has to be fenced on three sides leaving a side of 20 feet uncovered. If the area

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

Explanation:

Given that area of the field = 680 sq. feet

=> lb = 680 sq. feet

Length(l) = 20 feet

=> 20 × b = 680

=> b $= \dfrac{680}{20} = 34$ feet

Required length of the fencing = l + 2b = 20 + (2 × 34) = 88 feet

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