On Arbor Day, 25 students were originally planned to participate in tree planting activities, and each person would plant 12 trees on average. How many students are needed to complete the task?
植树节，原计划25个同学参加植树活动，平均每人要种12棵，如果平均每人只要种10棵．需要多少个同学才能完成任务？
<gadget id="calculator">12 * 25</gadget>
<output>300</output>

<gadget id="calculator">300 / 10</gadget>
<output>30</output>

<result>30</result>