What famous saying does this rebus mean?

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There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

I make two people out of one. What am I?

What Adam and Eve do not have but the rest of the people have?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?