Xiao Ming reads a book. On the first day, he reads 1/8 of the total pages of the book, and on the second day, he reads 20% of the remaining pages. There are 140 pages left to be read. How many pages are there in this book? ?
小明看一本书，第一天看了这本书总页数的(1/8)，第二天看了余下页数的20%，还剩140页没有看完，这本书共有多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">140 / (4/5)</gadget>
<output>175</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">175 / (7/8)</gadget>
<output>200</output>

<result>200</result>