Xiao Ming reads a book, he reads the whole book (3/10) on the first day, reads 24 pages on the second day, and leaves the whole book (3/5) unread. How many pages does this book have?
小明看一本书，第一天看了全书的(3/10)，第二天看了24页，还剩下全书的(3/5)没有看．这本书共有多少页？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/10) - (3/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">24 / (1/10)</gadget>
<output>240</output>

<result>240</result>