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?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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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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