Which number should replace the question mark?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

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

Can you write down eight eights so that they add up to one thousand?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What has no start, end, or centre?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?