Which alphabet letter is a question?

I know a nine-letter word having only one vowel.
Do you ?

Find out the missing number in the picture attached:

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

They are three errirs in this question. Can you find them?

Can you place three balls such that the equation shown in the picture holds true?