John has 10 pairs of matched socks. If he loses 9 individual socks, what is the greatest number of pairs of matched socks he can have left?  Pick one.
A) 7	B) 6	C) 5	D) 4	E) 3
Because we have to maximize the pair of matched socks, we will remove 4 pairs(8 socks) out of 10 pairs 1 sock from the 5th pair.   Thus the no of matching socks pair remaining = 10 -5= 
<gadget id="calculator">10 -5</gadget>
<output>5</output>
5   Answer 5
<result>C</result>
John has 10 pairs of matched socks. If he loses 9 individual socks, what is the greatest number of pairs of matched socks he can have left?