conversations.from: human
conversations.value: The city’s bus system carries 1,200,000 people each day. How many people does the bus system carry for 13 weeks?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: 13 weeks have 13 * 7 = 91 days.
  For 91 days the bus system carries 1,200,000 * 91 = 109,200,000 people.