The sixth grade students perform broadcasting exercises. If there are 15 people in each row, they can stand in 12 rows. Now, if you want to reduce the team by two rows, how many people should stand in each row? (Solve with ratio)
六年级同学进行广播操表演，如果每排站15人，正好能站12排，现在想使队伍减少两排，每排应站多少人？(用比例解)
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">180 / 10</gadget>
<output>18</output>

<result>18</result>