Question: Tom decides to take 10 dance lessons that cost $10 each, but he gets two of them for free. How much does he pay?
Answer with step-by-step thinking: He paid for 10 - 2 = 8 lessons. That means he pays 8 * $10 = $80.
So the answer is 80.

Question: Fiona completed 36 math questions in an hour. Shirley was able to complete twice as many math questions within that same time, and Kiana completed half of the sum of Fiona and Shirley's math questions. If they each did the same number of questions the following hour, how many math questions did all three girls complete in 2 hours?
Answer with step-by-step thinking: Shirley completed 36 x 2 = 72 questions. The sum of Fiona and Shirley's questions is 36 + 72 = 108. Kiana completed 108 / 2 = 54 questions. In one hour, they completed 108 + 54 = 162 questions. In two hours, they completed 162 x 2 = 324 questions.
So the answer is 324.

Question: There have been 15 "Where's Waldo?" books published. Each book has 30 puzzles to find Waldo. The average person takes 3 minutes to find Waldo in a puzzle. How long would it take to find every Waldo?
Answer with step-by-step thinking:
There have been 450 puzzles because 15 x 30 = 450. It would take 1,350 minutes to find all the Waldo's because 450 x 3 = 1,350.
So the answer is 1350.