1. HARD

In September 2011, there were 2308 students enrolled in a very large high school. In 2012, 561 students graduated and left the school and 512 students entered the school in September. In 2013, 602 students graduated and left the school and 588 students entered the school in September. How many students were there at this school in September 2013?

 
2. HARD

A shoe store starts off a day with a certain number of pairs of shoes. During the morning, 15 pairs are sold. During the afternoon, 16 pairs are sold and 5 are returned by unhappy customers. During the evening, 20 pairs are sold and 7 are returned. At the end of the day, the shoe store has 100 pairs of shoes left. How many shoes did the store start off with at the beginning of the day?

  1. 100
  2. 61
  3. 193
  4. 137
  5. 139