The school bought 200 story books, accounting for 4/5 of the science books. How many science books and story books did they buy?
学校买来200本故事书，占买来科技书的(4/5)，买来的科技书和故事书一共有多少本？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">200 / (4/5)</gadget>
<output>250</output>

<gadget id="calculator">250 + 200</gadget>
<output>450</output>

<result>450</result>