Liangliang read a book in three days, read the whole book (2/5) on the first day, read the rest (1/4) on the second day, and read 25 pages less on the second day than the first day. How many pages does the book have?
亮亮三天看完了一本书，第一天看了全书的(2/5)，第二天看了余下的(1/4)，第二天比第一天少看了25页，这本书共有多少页？
<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">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/5) * (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(2/5) - (3/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">25 / (1/4)</gadget>
<output>100</output>

<result>100</result>