Imagine a question and stream-of-consciousness explanation for which this is the answer: 90
Question: Mark loves to see shows in theaters. He decided to visit the theater at least once a week. One performance lasts 3 hours. The price of the ticket depends on the time spent in the theater and stands at $5 for each hour. How much will Mark spend on visits to the theater in 6 weeks?
Stream-of-consciousness: The price of one performance is 3 * $5 = $15. Mark intends to go to the theater once a week, so in 9 weeks he will spend 6 * $15 = $90.