Puzzle 74 - Simple questions

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 Or shall I say slightly silly?

  1. Which three positive integers have their sum equal to their product?
  2. There are several books in a book shelf. If a book is 4th book from the left and 9th book from the right, how many books are there totally?
  3. Can you arrange four 9s to make it a 100?
  4. A very old man dies on his 25th birthday? How is the statement correct?

You may know all the 4 answers as these are quite commonly asked riddles and not at all tough.

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