Gold Coins Riddle!!

Gold Coins Riddle!!

Darius lyons and Sigrid G

There are three bags of gold coins. All of the coins in two of these bags are real gold coins. All of the coins in the last bag are fake gold coins. All bags and all coins look the same.
Each real gold coin weighs one pound. Each fake gold coin weighs one pound and one ounce.
Find out which bag contains the fake gold coins by weighing the above-mentioned items only once.