The fifth and sixth grade students of Guangming Primary School donated a total of 1,080 books to the disaster area. The number donated by the fifth grade is that of the sixth grade (4/5). How many books are donated for the sixth grade?
光明小学五、六年级学生为灾区一共捐赠图书1080本．五年级捐的本数是六年级的(4/5)．六年级捐赠图书多少本？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">1_080 / (9/5)</gadget>
<output>600</output>

<result>600</result>