43 (You can make 44 = 20+24, 45 = 9×5, 46 = 20+20+6, etc. – but 43 is impossible.)
The “Chicken Nuggets Game” Explained: Strategy, Math, and Why It’s Addictive chicken nuggets game
McDonald’s originally sold nuggets in boxes of 6, 9, and 20. What’s the largest number of nuggets you cannot make using any combination of those box sizes? 43 (You can make 44 = 20+24, 45 = 9×5, 46 = 20+20+6, etc
