3 cloves of garlic can repel 2 vampires, 8 vampire bats or 3 wights. How many cloves of garlic are needed to repel 30 vampires, 12 wights and 40 vampire bats?
Let's think step by step.
72
First find the total number of cloves needed to repel the vampires: 30 vampires * 3 cloves / 2 vampires = 45 cloves.

Then find the total number of cloves needed to repel the wights: 12 wights * 3 cloves / 3 wights = 12 cloves.

Then find the total number of cloves needed to repel the vampire bats: 40 vampire bats * 3 cloves / 8 vampire bats = 15 cloves.

Then add up these three amounts to find the total number of cloves needed: 45 cloves + 12 cloves + 15 cloves = 72 cloves.

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The answer: 72