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 ?
Answer: B
Length * Breadth = Area
⇒20 * Breadth=680
⇒Breadth = 34 feet
Area to be fenced=2B+L=2*34+20
=88 feet