In this book, the number of pages I have read is 2.4 times that of the ones I have not read, and 42 pages more than the ones I have not read. How many pages does this book have?
这本书，我已经看完的页数是没看完的2.4倍，并且比没看完的多42页．求这本书有多少页？
<gadget id="calculator">2.4 - 1</gadget>
<output>1.4</output>

<gadget id="calculator">42 / 1.4</gadget>
<output>30</output>

<gadget id="calculator">30 * 2.4</gadget>
<output>72</output>

<gadget id="calculator">72 + 30</gadget>
<output>102</output>

<result>102</result>