Mr.Karim wants to put up fencing around three sides of his rectangular yard and leave a side of 10 feet unfenced. If the yard has an area of 340 sq. feet, how many feet of fencing does he need?

A 74
B 84
C 64
D None of these

Correct Answer: None of these

Area, Length×Width = 340 or,  Lenght×10 = 340 So, Length = 340/10 = 34 feet Fencing needed = 34 + 34 + 10 =  78 feet
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