A riddle. The answer’s on the web so I suppose if you don’t want to even try you can look it up. I’ll post the answer in a couple days.
Chicken McNuggets can be purchased in quantities of 6, 9, and 20 pieces. You can buy exactly 15 pieces by purchasing a 6 and a 9, but you can’t buy exactly 10 McNuggets. What is the largest number of McNuggets that can NOT be purchased?