There is no answer to that. Every time you go to the mission it changes how many socks he has. You can figure out how many socks he has by looking at the brown puffle house in the pet shop, which is located at the plaza. Figure out how many socks he has by solving and figuring out the code. Use the code sheet and the code on the right to figure it out.
its always a different number you just have to figure out the 2nd and 3rd words in the code
0 u cant have any pairs of socks on club penguin
55
23
5609
he has 75 pairs of socks
65
theres no answer
there is seventy five
62
72
45
35