How do you go from 98 to 720 using just one letter?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

What demands an answer, but asks no questions

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

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

If an electric train is travelling south, then which way is the smoke going?

Make a sentence consisting of three words that have the whole alphabet.

When it is alive we sing, when it is dead we clap our hands. What is it?