Lele read a storybook (4/7) a week, and just read 80 pages. How many pages are left in this book?
乐乐一个星期看了一本故事书的(4/7)，刚好看了80页，这本书还剩多少页没有看？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">80 / (4/7)</gadget>
<output>140</output>

<gadget id="calculator">140 - 80</gadget>
<output>60</output>

<result>60</result>