The students are playing games. There are 28 boys and 26 girls. Now they are divided into groups of 3 people. How many groups can they be divided into?
同学们做游戏，男生28人，女生26人，现在按3个人分一组，可以分成几组？
<gadget id="calculator">28 + 26</gadget>
<output>54</output>

<gadget id="calculator">54 / 3</gadget>
<output>18</output>

<result>18</result>