Xiaohong reads a 100-page story book, and has already read (3/5), how many pages are left?
小红看一本100页的故事书，已经看了(3/5)，还有多少页没看？
<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">100 * (2/5)</gadget>
<output>40</output>

<result>40</result>