The students went to work in the orchard. There were 47 female students and 37 male students. Every 4 students were divided into groups. How many groups can they be divided into?
同学们去果园劳动，女同学47人，男同学37人，每4个同学分成一组，一共可以分成多少组？
<gadget id="calculator">47 + 37</gadget>
<output>84</output>

<gadget id="calculator">84 / 4</gadget>
<output>21</output>

<result>21</result>