There are 210 popular science books in the school library, and there are more story books (1/3) than popular science books. How many story books are there in the library?
学校图书室有科普书210本，故事书比科普书多(1/3)，图书室有故事书多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">210 * (4/3)</gadget>
<output>280</output>

<result>280</result>