The school organized a visit to the Aviation Museum. 149 middle-grade boys went there, 132 girls went, and the number of senior grades was three times that of the middle grades. How many people went to the senior grades?
学校组织去航空博物馆参观，中年级男生去了149人，女生去了132人，高年级去的人数是中年级的3倍，高年级大约去了多少人？
<gadget id="calculator">149 + 132</gadget>
<output>281</output>

<gadget id="calculator">281 * 3</gadget>
<output>843</output>

<result>843</result>