My thoughts on the Dishes Puzzle
To solve this problem without algebra, I need to phrase this question. An unknown number of guests are handed a number of rice dish, a number of broth dish, a number of meat dish. The total number of dishes handed from rice, broth and meat are 65, and each dish is shared with 2, 3, 4 guests respectively. In this question, I can begin by trial and error. Starting with product of 2, 3 and 4 which is 24 guests, we would have 24/2 + 24/3 + 24/4 = 12 + 8 + 6 = 26 dishes. This is too low. Next I double the number of guests to 48, we would have 48/2 + 48/3 + 48/4 = 24 + 16 + 12 = 52 dishes. It is a little low. But I notice it increase with a linear trend with every 24 guests yielding 26 dishes which can be interpreted that every 1 additional guest contributes to 13/12 additional dishes. So I compute how many more guests from 48 (which yields 52 dishes) do I need to achieve 65 dishes. Note that, since you can't have fractions with number of guests, we would use a floor value. 48 + (65 - 52...