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?
95
92
88
82
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