conversations.from: human
conversations.value: I'm completely lost with this math problem: A tub of ice cream costing $13 is now sold at $11. A packet of milk was sold at a discount of $0.5. How much will you save if you buy 2 tubs of ice cream and 4 packets of milk?
  Can you give me a hand?
conversations.from: assistant
conversations.value: The discount for each tub of ice cream is $13 - $11 = $2.
  So the discount for 2 tubs of ice cream is $2 x 2 = $4.
  The total discount for 4 packets of milk is $0.5 x 4 = $2.
  You will save $4 + $2 = $6 for 2 tubs of ice cream and 4 packets of milk.