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? Pick:
A) 80
B) 82
C) 84
D) 88
E) 86
Area of the field =680 sq. feet.   Length of the adjacent sides are   20 feet and 68020=34 feet.   Required length of the fencing   =20+34+34= 
<gadget id="calculator">20+34+34</gadget>
<output>88</output>
88 feet   Answer is 88.
<result>D</result>
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?