There are 10 machines that dispense balls. All machines dispense balls that weight ten units each, except for one which dispenses balls of 9 units. You have one digital scale. Using one weighing only, you have to determine which is the faulty machine.
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Excel is very useful for the puzzle….
You can take 1 ball from first machine, 2 balls from second machine, 3 balls from the third machine and so on…….Depending upon the totals you can determine the faulty machine…
I have uploaded this excel sheet to see the totals
Solution to the Puzzle…