Teacher Gu reads a story book, 30 pages a day, and after three days, there are still 5/8 of the whole book that have not been read. How many pages does this storybook have?
顾老师看一本故事书，每天看30页，三天后还剩全书的(5/8)没有看．这本故事书共有多少页？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">90 / (3/8)</gadget>
<output>240</output>

<result>240</result>