When we see 2 but call 10?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

A man dies of old age on his 25 birthday. How is this possible?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

What is the centre of gravity?

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

Find the next number in the series below.

6 18 270 72090 ?