Xiaohong reads a story book. She reads 20% of the total pages of the book on the first day, and 25% of the total pages of the book on the second day. She reads 18 more pages on the second day than on the first day. How many pages are there?
小红看一本故事书，第一天看了全书总页数的20%，第二天看了全书总页数的25%，第二天比第一天多看了18页，这本书一共有多少页？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">18 / (1/20)</gadget>
<output>360</output>

<result>360</result>