A story book, Xiao Ming has read 45 pages, exactly 15% of the total pages of the book, how many pages are left?
一本故事书，小明看了45页，正好是这本书总页数的15%，还剩多少页没有看？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">45 / (3/20)</gadget>
<output>300</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">300 * (17/20)</gadget>
<output>255</output>

<result>255</result>