Arbor Day is here, and the school has organized 25 groups to participate in labor. Each group has 4 people who are responsible for digging holes and planting trees, and 2 people who are responsible for carrying water and watering trees. How many people participated in the labor?
植树节到了，学校组织了25个小组参加劳动，每组4人负责挖坑、种树，2人负责抬水、浇树，一共有多少人参加劳动？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 25</gadget>
<output>150</output>

<result>150</result>