The school bought 720 new books and distributed them to 6 grades. Each grade has 4 classes. How many books are distributed to each class on average?
学校买来720本新图书分给6个年级，每个年级4个班，平均每班分到图书多少本？
<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">720 / 24</gadget>
<output>30</output>

<result>30</result>