A rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing. If the poles of the fence are kept 4 metres apart, how many poles will be needed ? Choose the correct choice from the following options
A) 55	B) 70	C) 57	D) 58	E) None of these
Solution   Perimeter of the plot = 2(90 + 50) = 280 m.   ∴ Number of poles = [280/4= 
<gadget id="calculator">280/4</gadget>
<output>70</output>
70m Answer 70
<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 4 metres apart, how many poles will be needed ?