Coin identification
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There are 10 bags full of coins out of which one bag is full of fake coins which we don’t know. But you do know that genuine coins weigh 01 gram, but fake weighs 1.1 grams. We have to identify that bag in minimum readings a digital weighing machine. 
Take 1 coin from the first bag, 2 coins from the second bag . . . 10 coins from the tenth bag and simply weigh the picked coins together !
If there are no fake coins, then the total weight should be 110 grams – (1+2+3+4+…9+10)
if bag 4 has fake coins, then the weight will be 110.4 grams.
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