The school arranges 25 groups to plant trees. In each group, 4 people plant trees and 2 people water them. How many people participated in this tree planting activity?
学校安排25个小组去植树，每组中有4人植树、2人浇水．一共有多少人参加这次植树活动？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

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

<result>150</result>