There are 24 boys and 28 girls in Class 1 of the fourth grade. Every group of four will participate in labor. How many groups should be divided into?
四年级一班有男生24人，女生28人，每四人一组参加劳动，一共要分成多少组．
<gadget id="calculator">24 + 28</gadget>
<output>52</output>

<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<result>13</result>