A rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing. If the poles of the fence are kept 10 metres apart, how many poles will be needed ?  Choose the most appropriate option.
A) 28  B) 56  C) 57  D) 58  E) None of these
Solution   Perimeter of the plot = 2(90 + 50) = 280 m.   ∴ Number of poles = [280/10= 
<gadget id="calculator">280/10</gadget>
<output>28</output>
28m 28nswer 28
<result>A</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 10 metres apart, how many poles will be needed ?