The school bought 4 boxes of books, 81 books in each box, and distributed them to 6 grades on average. How many books were distributed to each grade?
学校买来4箱图书，每箱81本，平均分给6个年级，每个年级分得多少本？
<gadget id="calculator">81 / 6</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">4 * (27/2)</gadget>
<output>54</output>

<result>54</result>