The school distributes a batch of books to the fifth and sixth grades at a ratio of 4:5, 120 books are distributed to the fifth grade, and how many books are distributed to the sixth grade.
学校将一批图书按4：5比例分发到五年级和六年级，五年级分到图书120本，六年级分到图书多少本．
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<result>150</result>