Xiao Ming reads a story book. He read 50 pages on the first day, and 20% of the book on the second day. On the third day, he read 12 pages less than the second day, leaving 178 pages. How many pages does this storybook have?
小明读一本故事书，第一天读了50页，第二天读了这本书的20%，第三天读的页数比第二天少12页，这时还剩下178页．这本故事书一共有多少页？
<gadget id="calculator">38 + 178</gadget>
<output>216</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">216 / (3/5)</gadget>
<output>360</output>

<result>360</result>