The more of this there is, the less you see. What is it?

Who has married many women but was never married?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

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

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

How can you drop a raw egg from a height onto a concrete floor without cracking it?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?