Use of applied mathematics during hiring process for developers

Please solve a task. Look at the picture and write what is the area of a figure marked with ?

  1. 11
  2. 15
  3. 10
  4. 15
  5. ?
  6. 16
  7. 12
  8. ?
  9. 19 ?
  10. Don't know
  11. 11 != 12.
  12. 12
  13. 15
  14. no one knows?
  15. 7
  16. 15
  17. ?
  18. 15
  19. 15