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 does below Rebus say?

XLR8

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

What is the Surname of Barbie Doll?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

Find the next number in the series below

21 32 54 87 131 ?

What happened when the wheel was invented?

The centre of the third figure is empty. What digit should fit inside?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What is the end of everything?