/**
  * @param \_OurBrand_\Quiz\Domain\Model\Exercises\DragAndDropQuestion $question
  */
 public function addQuestion($question)
 {
     $question->setExercise($this);
     $question->setNumber($this->questions->count());
     $question->setSorting($this->questions->count());
     $this->questions->add($question);
     $this->maxScore = count($this->getRealQuestions());
 }