There are two solutions for this puzzle. One solution is
Divide the balls into 4-4 each
Weigh them against each other. The side which has the heavy ball will weigh more and remove the other 4.
Now divide them into a pair of 2-2.
Again measure them and take the side which weighs heavier.
Now weigh the two balls against each other and you will find the heavier one.
In total it will take 3 weighing.
Other Solution
Divide the balls into three pairs as 3,3,2.
Now weigh the 3-3 balls pair.
If you find them balanced then just weigh the remaining two you will get the heavy ball.
If the weigh is unbalanced take the 3 ball pair which is weighing heavy.
Now take 2 balls and weigh them.
If they are equal then the other ball is heavy or you will find the heavy ball.
In total it will take 2 weighing.
Divide the balls into 4-4 each
Weigh them against each other. The side which has the heavy ball will weigh more and remove the other 4.
Now divide them into a pair of 2-2.
Again measure them and take the side which weighs heavier.
Now weigh the two balls against each other and you will find the heavier one.
In total it will take 3 weighing.
Other Solution
Divide the balls into three pairs as 3,3,2.
Now weigh the 3-3 balls pair.
If you find them balanced then just weigh the remaining two you will get the heavy ball.
If the weigh is unbalanced take the 3 ball pair which is weighing heavy.
Now take 2 balls and weigh them.
If they are equal then the other ball is heavy or you will find the heavy ball.
In total it will take 2 weighing.
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