Xiaoxiao reads a storybook, and has read 90 pages, and there are (2/3) of this book left unread, how many pages does this storybook have?
笑笑读一本故事书，已经读了90页，还剩下这本书的(2/3)没有读，这本故事书一共有多少页？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">90 / (1/3)</gadget>
<output>270</output>

<result>270</result>