Xiao Ming reads a book, and on the first day he reads (3/8) of the whole book. At this time, he read 40 pages less than he did not read. How many pages does this book have?
小明看一本书，第一天看了全书的(3/8)，此时看了的比没有看的少40页．这本书一共有多少页？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8) - (3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 / (1/4)</gadget>
<output>160</output>

<result>160</result>