question_answer

Sameer needs to fence the field shown is the figure below. How much actual wire will be needed to fence the field? 1 unit = 3 metres

A) 10 metres        

B) 80 metres    

C) 90 metres                    

D) 60 metres

Correct Answer: C

Solution :

    (Show \[10\times 10\] grid) Units around the field = 6 + 2 + 2 + 2 + 3 + 2 + 7 + 6 = 30. Length of wire needed \[\Rightarrow \frac{1}{3}=\frac{30}{x}\Rightarrow x=3\times 30=90\]metres.