Which fur should we be getting from the Lion?

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 is next number in the pattern below:

131 517 192 123 ?

How can you make number one disappear by adding something to it?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What Time Should the last watch show in the below figure?

A man dies of old age on his 25 birthday. How is this possible?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?