conversations.from: human
conversations.value: I would love to understand how to solve this problem: Larry spent $5 for lunch and gave his brother $2. How much did Larry have at the beginning if he has $15 now?
  Can you explain?
conversations.from: assistant
conversations.value: Larry spent a total of $5 + $2 = $7.
  He has $15 + $7 = $22 at the beginning.