Xiao Ming reads a 120-page popular science book, and reads (2/5) first, how many pages are left?
小明看一本120页的科普书，先看了(2/5)，还剩多少页没有看？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 * (3/5)</gadget>
<output>72</output>

<result>72</result>