conversations.from: human
conversations.value: Can you break down the solution for me for this math problem: Ashley's pizza delivery costs $15. What is the total amount that Ashley should give the delivery man if she wants to give a tip that is equal to 1/5 of the amount she ordered?
conversations.from: assistant
conversations.value: The tip that Ashley wants to give amounts to $15 x 1/5 = $3.
  Hence, she will give a total of $15 + $3 = $18 to the delivery man.