The sixth grade of the second primary school donated books to the Hope Project. The book donation ratio between boys and girls was 3:5. Boys donated a total of 210 books. How many books did the sixth grade donate?
二小六年级为希望工程捐书，男生和女生的捐书比为3：5，男生一共捐了210本，六年级一共捐了多少本书？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">210 / (3/8)</gadget>
<output>560</output>

<result>560</result>