conversations.from: human
conversations.value: Randy had 32 biscuits. His father gave him 13 biscuits as a gift. His mother gave him 15 biscuits. Randy’s brother ate 20 of these biscuits. How many biscuits are Randy left with?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: After his father gave him 13 biscuits, Randy has 32 + 13 = 45 biscuits.
  After his mother gave him 15 biscuits, Randy has 45 + 15 = 60 biscuits.
  After his brother ate 20 of the biscuits. Randy has 60 – 20 = 40 biscuits.