what does the word "share" mean

I have a math question, but relating the meaning of the word "share". Say, for example, I have 6 books. I want to share these books with five of my friends. So each of us will get one book. Now, for the question, how many books did I share? What will be the answer.

I am not a native English speaker. The question seems to be ambiguous to me.

One answer could be, 6. And the other answer could be 5. I think both are correct.

I.e. I shared 6 books with my friends.
I shared 5 books with my friends (which means I left one book for my self).

What do you think?

Your help will be appreciated.