2024 AMC 8 Problems/Problem 8
Problem
==Solution 1== (BRUTE FORCE) How many values could be on the first day? Only 5, or 5, you have 8, and for 8 or 10, you have 20, for 16 or 8, you have 11, and for 14 or 11,$16 repeat leaving you with 8-2 = 6 different values