There were originally 30 classmates, and 15 more came. How many rows can these students line up with 5 people?
原来有30个同学，又走来15个．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>