Right O, I can try and explain this a bit better now I'm on my laptop and not on my phone
so...
bag 1 - 1 coin
bag 2 - 2 coins
bag 3 - 3 coins
bag 4 - 4 coins
bag 5 - 5 coins
all get weighed at the same time so you are only using the scales once (not adding or removing weight as the other posts suggested)
so if they were all real gold you would have 15 grams total
however many 0.1 grams it is over by will show which bag is the fake, so for example if you have 15.3 grams then you know that the 3rd bag is the fake, 15.5 and you know that the 5th bag is the fake
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