A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 120 sq. feet, how many feet of fencing will be required?	Choose the correct choice from the following answers
A) 34
B) 40
C) 68
D) 88
E) 32

Rationale: "we have : l = 20 ft and lb = 120 sq . ft . so , b = 6 ft . length of fencing = ( l + 2 b ) = ( 20 + 12 ) ft = 32 ft . answer : e"
Answer: E