conversations.from: human
conversations.value: Allen ordered five boxes of pizza, which cost $7 each box. He then gave a tip which amounts to 1/7 of the total cost of his order. If he gave the delivery man $100, how much change did he receive?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: The total cost of five boxes of pizza is $7 x 5 =$35.
  He gave $35 x 1/7 = $5 tip to the delivery man.
  He spent a total of $35 + $5 = $40 for the pizza and the tip.
  The change that he received is $100 - $40 = $60.