It's in Professor Layton and the Curious Village, Wi-Fi puzzle no. 25
Here's the riddle:
At the edge of town, there is a traditional private school with 10 boys, 10 girls, and a single teacher.
The school requires students to show proper respect to the teacher and other students by greeting the teacher and other students with one bow.
How many bows could you expect to see on a given morning?
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