In order to support the students of the disaster-stricken schools, some students of Xinhua Primary School launched a book donation activity. The fourth grade donated 120 books, the fifth grade donated three times as much as the fourth grade, and the sixth grade donated 20 more books than the fifth grade. How many books did the sixth grade students of Xinhua Primary School donate?
为了支援受灾学校的学生，新华小学部分学生开展了捐书活动．四年级捐120本，五年级捐的图书是四年级的3倍，六年级捐的本数比五年级多20本．新华小学六年级学生捐了多少本书？
<gadget id="calculator">120 * 3</gadget>
<output>360</output>

<gadget id="calculator">360 + 20</gadget>
<output>380</output>

<result>380</result>