John has 10 pairs of matched socks. If he loses 11 individual socks, what is the greatest number of pairs of matched socks he can have left?
Choose the correct choice from the following answers:	A) 7	B) 6	C) 5	D) 4	E) 3
Because we have to maximize the pair of matched socks, we will remove 5 pairs(10 socks) out of 10 pairs 1 sock from the 6th pair.   Thus the no of matching socks pair remaining = 10 -6= 
<gadget id="calculator">10 -6</gadget>
<output>4</output>
4   Answer 4
<result>D</result>
John has 10 pairs of matched socks. If he loses 11 individual socks, what is the greatest number of pairs of matched socks he can have left?