There are 25 groups in total, 4 people in each group are responsible for digging holes to plant trees, and 2 people are responsible for carrying water and watering trees. How many students participated in this tree planting activity?
一共有25个小组，每组里4人负责挖坑种树，2人负责挑水浇树，一共有多少名同学参加了这次植树活动？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

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

<result>150</result>