Question: On the island of Castor, there are 40 chess players. A quarter of the island's chess players have never lost to an AI. How many people on the island have lost to a computer, at least once? Think carefully first, then make a decision:
Chess players that have never lost to an AI is 40 / 4 = 10 people. Chess players that have lost to an AI is 40 - 10 = 30 people. So the answer is 30.