You have 12 balls, all identical in size and appearance, but one of them is either heavier or lighter than the rest. You have a balance scale, and you can use it three times. How can you determine which ball is different and whether it is heavier or lighter?
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There are 12 identical ball some are heavier or lighter
First of all, divide the ball into three group of four
Weight one group against other
If one group is heavier then more heavier ball are in that group
Of the group weight the same the heavier group it is ie third
If the third group is not heavier then pick two balls and weight them. Weight these balls the ball is higher weight the it means that ball is heavy