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Sorry but I have a problem with my keyboard so I have to write in English
regarding the riddle : we take a increased sequence of the ball i.e one ball from the first box and tow from the second and three from the third etc ..........
now we weight the balls we've already taken
if all balls are equal we shall have 55 KG
but as we have some different balls the number won't be 55 KG rather we'll a weight reversely proportional to the number of different balls
i.e if we have one different ball the weight will fall 100 G and so we know that the different box is NO 1 cause we took one ball of it
the same way if we have weight fall of 200 G we know that there are two different balls and the different box will be No 2
and the same for 3 or 4 or 10