Xiao Ming reads a book, and he reads the whole book (2/5) in the first 5 days, and there are still 24 pages left. How many pages does this book have?
小明看一本书，前5天看了全书的(2/5)，还剩下24页没有看．这本书一共有多少页？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">24 / (3/5)</gadget>
<output>40</output>

<result>40</result>