There were originally 30 classmates on the playground, but another 15 came. How many rows can these students line up with 5 people?
操场上原有同学30人，又走来15人．这些同学5人排一行，可以排几行？
<gadget id="calculator">30 + 15</gadget>
<output>45</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>