Assignment:
3 guys walked out a restaurant and saw a bowl of M&Ms. Guy 'A' took a third and returned 4. Guy 'B' took a quarter of what's left and returned 3. Guy 'C' took half of the rest and returned 2.
- How many M&Ms was in the bowl if 17 is left?
Provide complete and step by step solution for the question and show calculations and use formulas.