The third grade students went to work in the orchard, 30 boys and 39 girls. If every 3 people are divided into groups, how many groups should be divided in total?
三年级同学去果园劳动，男生30人，女生39人．如果每3人分成一组，一共要分多少组？
<gadget id="calculator">30 + 39</gadget>
<output>69</output>

<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<result>23</result>