A second-grade student went to the movies, bought 82 tickets, and returned 9 tickets. How many students in the second grade watched the movie?
二年级同学去看电影，买了82张票，后来退了9张．二年级有多少同学看了电影．
<gadget id="calculator">82 - 9</gadget>
<output>73</output>

<result>73</result>