Xiaohong reads a book. On the first day, the ratio of the number of pages she read to the rest is 1:3. On the second day, she reads 20% of the book, and there are 33 pages left. How many pages does the book have?
小红看一本书，第一天看的页数与剩下的比是1：3，第二天看了全书的20%，还剩下33页没有看，这本书共有多少页？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">33 / (11/20)</gadget>
<output>60</output>

<result>60</result>