Xiao Ming reads an extra-curricular book, and has already read (2/3) of the whole book, which happens to be 40 pages. How many pages does this extracurricular book have?
小明看一本课外书，已经看了全书的(2/3)，正好是40页．这本课外书有多少页？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">40 / (2/3)</gadget>
<output>60</output>

<result>60</result>