A book has 120 pages, Xiao Ming has read 65%, how many pages are left?
一本书有120页，小明已经看了65%，还剩多少页没看？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">120 * (7/20)</gadget>
<output>42</output>

<result>42</result>