10000 balls

来源: 2003-07-03 22:44:00 [旧帖] [给我悄悄话] 本文已被阅读:

There are 100 boxes of balls of same apprearence. Each box has 100 balls. Each ball is 1 pound in 99 boxes. One box has balls of 11 oz. How do you use a scale one time to find the balls that are lighter than normal?