Xiaohong reads a storybook. She reads 25% of the storybook on the first day, and reads 20 pages less on the second day than on the first day. There are 60 pages left. How many pages are there in this storybook?
小红看了一本故事书，第一天看了25%，第二天比第一天少看了20页，还剩60页没有看，这本故事书有多少页？
<gadget id="calculator">60 - 20</gadget>
<output>40</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / (1/2)</gadget>
<output>80</output>

<result>80</result>