If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

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

which number am I?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

Do You See It?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Why did the Girl throw the butter out of the window?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?