Source: John Gregory & Dale Seymour's *Limerick Number Puzzles* (Creative Publications, 1978)

**Hint:** Take one clue at a time in the order given...try to write down what options remain at each step.

**Solution Commentary:** Algebra is not needed to solve this limerick. Rather the key is to think your way to a solution using problem solving skills such as establishing special cases, looking for patterns, building tables, etc.

For example, start with (AB)/C. Given clues #1 and #5, what can C be? Then focus on clue #3 and finally clue #4.

Is the answer unique?

Finally, I wish this book was still in print. My students always enjoyed these limericks and learned alot about the reasoning process as a precursor to the formal proof process. I will try to include more limericks later on.