A rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing. If the poles of the fence are kept 5 metres apart, how many poles will be needed ? Choose the correct choice from the following options:
A) 55
B) 56
C) 57
D) 58
E) None of these
Solution   Perimeter of the plot = 2(90 + 50) = 280 m.   ∴ Number of poles = [280/5= 
<gadget id="calculator">280/5</gadget>
<output>56</output>
56m Answer 56
<result>B</result>
A rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing. If the poles of the fence are kept 5 metres apart, how many poles will be needed ?