Zhang Li reads a novel. On the first day, she reads 1/4 of the whole book. The ratio of the number of pages she read on the second day to the number of pages she read on the first day is 6:5. On the third day, she reads 78 pages. At this time There are 12.5% of the book left unread, how many pages does this book have?
张丽看一本小说，第一天看了全书的(1/4)，第二天看的与第一天看的页数的比是6：5，第三天看了78页，这时还剩下全书的12.5%没看，这本书共有多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/4) * (6/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">1 - (1/4) - (3/10) - 0.125</gadget>
<output>0.325</output>

<gadget id="calculator">78 / 0.325</gadget>
<output>240</output>

<result>240</result>