There are 150 science and technology books in the school library, and the number of science and technology books is less than that of story books (4/5). How many story books are there in the library?
学校图书馆有科技书150本，科技书的数量比故事书少(4/5)，图书馆有多少本故事书？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 / (1/5)</gadget>
<output>750</output>

<result>750</result>