The school bought a batch of new books, including 80 science books and 120 story books. These two books account for 4/5 of the total number of new books. How many books are there in total?
学校买来一批新书，其中科技书80本，故事书120本，这两种书共占新书总数的(4/5)，这批新书一共有多少本？
<gadget id="calculator">80 + 120</gadget>
<output>200</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<result>250</result>