The school organizes fourth and fifth grade students to participate in "Learning from Lei Feng" voluntary labor. 90 people went to the fourth grade, and three times as many people went to the fifth grade as the fourth grade. How many people did they go to?
学校组织四、五年级学生参加"学雷锋"义务劳动．四年级去了90人，五年级去的人数是四年级的3倍，他们一共去了多少人？
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">90 + 270</gadget>
<output>360</output>

<result>360</result>