Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

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?

Remove two matchsticks to make the below equation correct.

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

ST ND RD TH '?'

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Count the number of triangles in the picture below:

Find the next number in the series below

21 32 54 87 131 ?