I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Thursday, April 15, 2010
A man had six working clocks in his house and he always checked them before going to bed. One morning he woke up and the three upstairs clocks said 8:15 while the 3 downstairs clocks said 7:30. What happened?