The Sea of Monsters

What do the numbers 30,31,75,12 mean to Percy Jackson?

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Last updated by Jill W
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In The Sea of Monsters, Percy receives these numbers from the Three Fates (Gray Sisters). At first the numbers mean nothing to him, but later he realizes that they are coordinates for where Grover is being held with the Golden Fleece (which will restore Thalia's tree).

Source(s)

The Sea of Monsters