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Question

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?

Options:
A .  34
B .  40
C .  68
D .  88
E .  None of these
Answer: Option D
 -    We have: l = 20 ft and lb = 680 sq. ft.
  So, b = 34 ft.
 
  Length of fencing = (l + 2b) = (20 + 68) ft = 88 ft.

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