Xiaogang reads a storybook. He read 37.5% of the whole book on the first day, 40% of the whole book on the second day, and just finished reading 18 pages on the third day. How many pages does this storybook have?
小刚看一本故事书，第一天看了全书的37.5%，第二天看了全书的40%，第三天看了18页刚好看完，这本故事书共多少页？
<gadget id="calculator">37.5 / 100</gadget>
<output>0.375</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - 0.375 - (2/5)</gadget>
<output>0.225</output>

<gadget id="calculator">18 / 0.225</gadget>
<output>80</output>

<result>80</result>