A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 10 sq. feet, how many feet of fencing will be required?	Pick:
A) 34
B) 40
C) 68
D) 21
E) 78
We have: l = 20 ft and lb = 10sq. ft.   So, b = 0.5 ft.   Length of fencing = (l + 2b) = (20 + 1)= 
<gadget id="calculator">(20 + 1)</gadget>
<output>21</output>
21 ft.   ANSWER:21
<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 10 sq. feet, how many feet of fencing will be required?