How many bottle of enchanting to level 30

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The Bottle o' Enchanting is an item in Minecraft obtained throught the Creative Mode inventory and Trading only, it cannot be crafted. 

When thrown Bottles o' Enchanting will award the player between 3-11 experience orbs.

Bottles o' Enchanting cost between 3-5 emeralds when trading. 

• Since the Bottle o' Enchanting can be traded with the Villager Priest this makes of a good xp farm as long as the player has a good stash of emeralds on them. 
• A whole stack of Bottles o' Enchanting will give the player between 193-704 xp. 
• Bottles o' Enchanting can be thrown like Snowballs (by right-clicking).