Use of applied mathematics during hiring process for developers

Please solve a task. How it is possible to make two squares from 13 building blocks?

  1. Ring of side length 4 (12 blocks) and 1 block by itself. 2 squares.
  2. 9+4 - Don't understand the task in fact, and how am I supposed to give an answer? attach picture? :)
  3. p
  4. The task does not say, that these building blocks are all equal :), so in many ways.
  5. imposible
  6. 3x3 and 2x2 squares (9+4=13)
  7. 9
  8. 4 + 9
  9. 9/4
  10. Don't know