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. feet, how many feet of fencing will be required? Pick one:
A) 34
B) 40
C) 68
D) 88
E) 78
We have: l = 20 ft and lb = 680 sq. ft.   So, b = 34 ft.   Length of fencing = (l + 2b) = (20 + 68)= 
<gadget id="calculator">(20 + 68)</gadget>
<output>88</output>
88 ft.   ANSWER:88
<result>D</result>
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. feet, how many feet of fencing will be required?