Sudoku

sudoku32

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Puzzle

There are 10 sets of 10 coins. You know how much the coins should weigh. You know all the coins in one set of ten are exactly a hundredth of an ounce off, making the entire set of ten coins a tenth of an ounce off. You also know that all the other coins weight the correct amount. You are allowed to use an extremely accurate digital weighing machine only once.

How do you determine which set of 10 coins is faulty?

Answer  : I would put all the 10 sets on the digital weighing machine, and observe the decreasing amount by  take off each set one by one ,if its not equal to 1/10 then the preceded set would be the faulty one.