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cv2001
The least common denominator for your question is 12. Rice serves 2, Soup Serves 3, Chicken Serves 4. Least common denominator for 2,3, and 4 is 12. So for every 12 guests you would use 6 bowls of rice, 4 bowls of soup, and 3 bowls of chicken giving you total bowls of 13. So 12 guests = 13 bowls. Divide 65 total bowls by 13 bowls = 5. So to cover 65 bowls you would serve 60 guests which is 5 sets of 12.