Question 1

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Q: What is 8 + 7?

The sum of 8 and 7 is 15.



Question 2

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Q: What is 8 + 7 on a clock?

With the hour hand on 8, move it 7 spaces further and it will land on 3.

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Question 3

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Q: What is 8 + 7 in Z[9]?

We can think of Z[9] as a 9-hour clock. With the hour hand on 8, and moved 7 spaces further, it will land on 6.