If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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?

Prove that the below maths equation is true.

8 + 8 = 91

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Which is the smallest number that you can write using all the vowels exactly once?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

When it's bad luck to meet a black cat?

Complete the following series. It.s very logical:

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

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?