First find the number of substitute teachers left after half quit: 60 teachers / 2 = <<60/2=30>>30 teachers
Then find how many teachers quit after an hour but before lunch: 30 teachers * 30% = <<30*30*.01=9>>9 teachers
Then subtract that number from the number of teachers left after one hour to find how many are left after lunch: 30 teachers - 9 teachers = <<30-9=21>>21 teachers
#### 21