This math problem has got me stumped: Tina buys 3 12-packs of soda for a party.  Including Tina, 6 people are at the party.  Half of the people at the party have 3 sodas each, 2 of the people have 4 and 1 person has 5.  How many sodas are left over when the party is over?
Can you show me the way?