The school has 240 popular science books, more than story books (1/7). How many story books are there?
学校有科普书240本，比故事书多(1/7)，故事书有多少本？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + (1/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">240 / (8/7)</gadget>
<output>210</output>

<result>210</result>