Proportions

8 out of 4 ball is in left side

Now dividing 50 by (8+4) = 12

We get 4.166, Taking only integer part 4

In 4 turns, he will put 32 balls in right side , 16 balls in left side

In fifth turn , he has 2 ball only

Which he will again put in right box

Therefore total balls in right box = 32+2 = 34 balls

The posted question is in a dialect of incompetence. There is no solution as presented; there is no known method for separating “eight out of four balls.”   

 

The presented solution is useless, except as an example of ineptitude. 

Sorry Aj,

Second answerer is rude but also correct.