In order to support the disaster area, an experimental primary school in a certain county launched a book donation activity. The fourth grade donated 150 books, the fifth grade donated 60 more books than the fourth grade, and the sixth grade donated three times as much as the fifth grade. How many books did the sixth grade donate?
为支援灾区，某县实验小学开展捐书活动．四年级捐了150本，五年级比四年级多捐了60本，六年级捐的本数是五年级的3倍，六年级捐了多少本？
<gadget id="calculator">150 + 60</gadget>
<output>210</output>

<gadget id="calculator">210 * 3</gadget>
<output>630</output>

<result>630</result>