Students do radio exercises, 15 people stand in each row, exactly 4 rows. If there are 5 rows, how many people stand in each row?
同学们做广播操，每行站15人，正好站4行．如果站5行，每行站多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 * (4/5)</gadget>
<output>12</output>

<result>12</result>