The school bought a batch of new books, including 300 story books and 180 science and technology books, accounting for 60% of the new books. How many new books are there in this batch?
学校买来一批新书，其中故事书有300本，科技书有180本，共占这批新书的60%．这批新书有多少本？
<gadget id="calculator">300 + 180</gadget>
<output>480</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">480 / (3/5)</gadget>
<output>800</output>

<result>800</result>