Sock pot Power

Today i learn about how to solve my maths problem by using my strategy.

What i learn today is about the sock pot power and this is what i did.

 Which one of them that has the most correct answer in the table below to win the competition.
Julie.                                     Colin                                     Hemi
2,2,2=6                               3,3=6                                  not correct 6
2,2,2,2,2=12                       3,3,3,3=12                         not correct 12
2,2,2,2,2,=10                      not correct 10                     5,5=10
 15 not correct                     3,3,3,3,3=15                      5,5,5=15
2,2,2,2,2,2,2,2,2,2=20        not correct 20                      5,5,5,5=20