The students stand in line on the playground. There are 28 people in Class 5 1 and 35 people in Class 5 2. If the number of people in each row of the two classes is the same, how many rows should they stand in total?
同学们到操场站队，五1班有28人，五2班有35人．如果两个班每行的人数相同，至少一共站多少行？
<gadget id="calculator">28 / 7</gadget>
<output>4</output>

<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<result>9</result>