Friday, we posed this riddle: A fast food restaurant sells chicken in orders of 6, 9, and 20. What is the largest number of pieces of chicken you cannot order from this restaurant? The answer is 43. The trick is to consider multiples. (For example, after six, all numbers divisible by three can be ordered because they're sums of sixes and nines.) Chapoton Sanders Scarborough partner Brad Scarborough was the first person to get it right, and Comerica Bank's Mike Hammond was our randomly selected winner. Both get a free ticket to Bisnow's Industrial Summit.