Replace the question mark with the correct number below.

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

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I look at you, you look at me I raise my right, you raise your left. What am I?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?