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Area - General Aptitude

Q1:

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?

A 34

B 40

C 68

D 88

ANS:D - 88

We have: l = 20 ft and lb = 680 sq. ft. So, b = 34 ft.  Length of fencing = (l + 2b) = (20 + 68) ft = 88 ft.