conversations.from: human
conversations.value: Solve the following math problem: Morgan goes to the drive-thru and orders his lunch.  He gets a hamburger for $4, onion rings for $2 and a smoothie for $3. If he pays with a $20 bill, how much change does he receive?
conversations.from: assistant
conversations.value: Morgan’s lunch cost $4 + $2 + $3 = $9.
  If he pays with a $20 bill, he will receive change of $20 - $9 = $11.