Xiaohong reads a book in two days. On the first day, she reads more (1/4) than on the second day, and on the second day she reads 50 pages less than the first day. How many pages does this book have?
小红两天看完一本书，第一天看的比第二天多(1/4)，第二天比第一天少看50页，这本书有多少页．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / (1/4)</gadget>
<output>200</output>

<gadget id="calculator">200 + 50 + 200</gadget>
<output>450</output>

<result>450</result>