question_answer

Four square plots of side 30 m each are in a row. What length of barbed wire is required to fence the plots?

A) 300 m    

B) 3000 m

C) \[\text{30 }{{\text{m}}^{\text{2}}}\]     

D) \[\text{300 }{{\text{m}}^{\text{2}}}\]

Correct Answer: A

Solution :

The square plots in a row form a rectangle with length \[4\text{ }\times \text{ }30\text{ }m\] = 120m and width 30m. Length of barbed wire \[=2\times (120+30)\text{ }m=2\times 150\text{ }m=300\text{ }m\]