Students in the fourth, fifth and sixth grades of a certain school go to the theater to watch a movie. There are 137 students in the fourth grade, 143 students in the fifth grade, and 162 students in the sixth grade. On average, every 17 people sit in a row. How many rows of seats are needed?
某校四、五、六年级同学去影剧院看电影，四年级137人，五年级143人，六年级162人，平均每17人坐一排，需多少排座位？
<gadget id="calculator">137 + 143 + 162</gadget>
<output>442</output>

<gadget id="calculator">442 / 17</gadget>
<output>26</output>

<result>26</result>