Students in class 13 of the 11th session do radio exercises. If there are 10 people standing in each row, they need to stand in 6 rows. If there are 5 more people in each row, how many rows do they need to stand in?
11届13班同学做广播操，如果每行站10人，需要站6行，如果每行增加5人，需要站多少行．
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">6 / 15</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<result>4</result>