what does the below rebus means?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

I have an eye but still cannot see.

Who am I?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

If eleven plus two equals one, what does nine plus five equal?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?