Class One of the sixth grade of Weimin Primary School donated 546 books to primary schools in impoverished mountainous areas, accounting for 35% of the total number of books donated in the whole year. How many books are donated in the whole year?
为民小学六年级一班向贫困山区小学捐赠图书546本，占全年级捐书总数的35%，全年级捐书多少本？
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">546 / (7/20)</gadget>
<output>1_560</output>

<result>1_560</result>