20. Scott has \( 348 \) comic books. He places the comic books into \( 8 \) boxes. He puts an equal number of comic books in each box. How many comic books are in each box?

(21) \( 639 \) people see a movie on Saturday. \( 711 \) people see the movie on Sunday. How many people saw the movie in all? -

\( 427 \) people bought popcorn during the movie. How many people did not buy popcorn during the movie?