Tim works each day from Monday to Friday. At 5pm each day at work Tim receives 7 tokens. At 1pm on any day at work Tim can exchange a certain number of these tokens for a free meal (which always costs the same number of tokens). On the morning of Monday 1st Tim had 20 tokens. He will take a free lunch on any day that he has enough tokens. The first day that Tim cannot get a free meal is Tuesday 9th .