There are 36 students in the first class of the third grade, and 42 students in the second class. The two classes do gymnastics together. If every 6 people stand in a row, how many rows can they stand in total?
三年级一班有36人，二班有42人，两班在一起做体操，如果每6人站一行，一共可以站几行？
<gadget id="calculator">36 + 42</gadget>
<output>78</output>

<gadget id="calculator">78 / 6</gadget>
<output>13</output>

<result>13</result>