Answer:
36
Step-by-step explanation:
1/3 = for every 1 white sock there are 3 black socks
1 times 12 = 12
/ /
3 times 12 = 36
i multiplied 1 times 12 = 12
and 3 times 12 = 36
or you can also do this:
1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1+ 1+ 1
3 +3 +3 +3 +3 +3+3+3+3+3+3+3
you can also simplify 12/36 and it will give you 1/3