Riddle

I have 10 books and I label them with their number. I take seven out to read. How many books are left?

Choose an answer

A.3
B.7
C.10
D.9! You have token the book with the label seven!
Hint: It's a 9-word phrase with 36 letters, starting with "9".

Answer

9! You have token the book with the label seven!

Why this is the answer

Since the books are labeled by number, taking out 'book number seven' removes only one book, leaving nine.

This riddle is filed under How, What, Why Riddles and rated Hard.