Aubrey has a shelf full of books. • Exactly 1 }3  of the books on the shelf are mysteries. • Aubrey has read 10 of the mysteries on the shelf. • The number of mysteries Aubrey has read is greater than 1 }5  of the number of  mysteries on the shelf and less than 1 }4  of the number of mysteries on the shelf. Which could be the number of books on the shelf?

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