Ball in the box

Logic Level 3

There are 10 boxes, of 10 balls in each of the box. Each ball weigh \(10\text{ g}\). Now for instance, Any one of the box is replaced with another box, of each 10 balls, where each ball weigh \(9\text{ g}\) instead. You have one electronic machine.

Find out how many number of trails you need to find which box contains \(9\text{ g}\) balls.


  • Taking a box is counted as a trail (eg. taking 2 boxes means 2 trails)

  • Taking balls from any boxes is counted as a trail (eg. taking 1 ball from first box, 5 balls from last box means 1 trail only)


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