Xiao Ming reads a popular science book, and has read 20% of the whole book, which is 36 pages less than the rest. How many pages are there in this popular science book?
小明看一本科普书，已经看了全书的20%，比余下的少36页，这本科普书一共多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">36 / (3/5)</gadget>
<output>60</output>

<result>60</result>