Xiao Ming reads a story book, and has already read 80 pages, and there are (3/5) left to read, how many pages are there in the whole book?
小明看一本故事书，已经看了80页，还剩(3/5)没看，全书有多少页？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 / (2/5)</gadget>
<output>200</output>

<result>200</result>