The school bought 9 boxes of books, 80 books in each box, and distributed them to 5 grades on average. How many books were distributed to each grade?
学校买来9箱图书，每箱80本，平均分给5个年级，每个年级分得多少本？
<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">80 * (9/5)</gadget>
<output>144</output>

<result>144</result>