What is common among 11, 69, and 88?

In the formation, you can see a few arranged matchsticks. Can you form three squares by moving just three matchsticks?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Which number should replace the question mark?

In a certain bank, a man deposits a certain amount. According to the bank policies, the amount will be doubled up in a year but as the service charge, they will also deduct Rs. 65 by the end of every year.

If after the 6th year, the amount becomes 0, what do you think is the original amount he deposited in the bank?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

What is both possible and impossible at the same time?