conversations.from: human
conversations.value: Fred was having a party and was responsible for buying canned soda.  He figured every guest would drink 2 sodas and he was inviting 15 people to the party.  The local store had a deal on sodas that week.  Every 6 pack of canned sodas was on sale for $3.00.  How much would it cost Fred to buy enough sodas for every guest to have 2 cans?
  Can you solve this problem?
conversations.from: assistant
conversations.value: He planned on 2 sodas per guest and invited 15 guests so 2*15 =30 cans of soda
  Each pack of soda had 6 cans. He needed to buy 30 cans of soda for his guest so 30/6 = 5 packs of soda
  The soda was on sale for $3.00 per 6 pack and he was buying 5 packs so 3*5 = $15.00 for soda