The students were divided into 25 groups to participate in the school tree planting activity. In each group, 4 people were responsible for planting trees and 2 people were responsible for watering; each group had to plant 5 trees, and each tree had to be watered with 2 buckets of water. How many people participated in the school tree planting activity?
同学们分成25个小组参加学校种树活动，每组里4人负责种树，2人负责浇水；每组要种5棵树，每棵树要浇2桶水．一共有多少人参加学校种树活动？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

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

<result>150</result>