Lizzy: The city's bus system carries 1,200,000 people each day. How many people does the bus system carry for 13 weeks?.
Me: Hmmm, let me think. I think this is the detailed solution:
13 weeks have 13 * 7 = 91 days. For 91 days the bus system carries 1,200,000 * 91 = 109,200,000 people. Final answer: 109200000.