Bowling ball

Question: Your job is bowling ball tester. You have two identical bowling balls. Given a 100-story building, your challenge is to figure out from which floor a dropped bowling ball will¬†shatter on the ground. You know nothing about the durability of the bowling balls; they may be very fragile and shatter when dropped from the … Continue reading Bowling ball

12 balls

Question: You have 12 balls. All of them are identical except one, which is either heavier or lighter than the rest. The odd ball is either hollow while the rest are solid, or solid while the rest are hollow. You have a scale, and are permitted three weighings. Can you identify the odd ball and … Continue reading 12 balls