Students from the primary school affiliated to the Chinese Academy of Sciences went to the spring outing. 120 students went to the third grade, twice as many students went to the fourth grade, and 30 fewer students went to the fifth grade than the sum of the third and fourth grades. how many people?
中国科学院附属小学的同学们去春游，三年级去了120人，四年级去的人数是三年级的2倍，五年级去的人数比三、四年级的总和少30人，五年级去春游的有多少人？
<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">240 - 30</gadget>
<output>210</output>

<gadget id="calculator">120 + 210</gadget>
<output>330</output>

<result>330</result>