The school buys a batch of books. If they distribute them to 12 classes on average, each class can get 25 books. If they distribute them to 15 classes on average, how many books will each class get?
学校购进一批图书，如果平均分给12个班，每班可得25本，如果平均分给15个班，每班分得多少本？
<gadget id="calculator">12 / 15</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5)</gadget>
<output>20</output>

<result>20</result>