Xiao Ming reads a book, he reads 10 pages on the first day, 15 pages on the second day, and (1/4) of the whole book in these two days. So how many pages does this book have?
小明看一本书，第一天看了10页，第二天看了15页，这两天看了全书的(1/4)．那么这一本书一共有多少页？
<gadget id="calculator">10 + 15</gadget>
<output>25</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<result>100</result>