Xiaoxiao has 12 story books, which is (2/3) of the number of naughty story books. How many story books does naughty have?
笑笑有12本故事书，是淘气的故事书的本数的(2/3)，淘气有多少本故事书．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 / (2/3)</gadget>
<output>18</output>

<result>18</result>