Xiaohua reads a story book, and the number of pages he has read is 15 more than the whole book (1/3), and 15 pages are less than the number of pages he has not read. How many pages are there in this book?
小华看一本故事书，已看的页数比全书的(1/3)多15页，比没看的少15页，这本书共有多少页？
<gadget id="calculator">15 + 15 + 15</gadget>
<output>45</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3) - (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">45 / (1/3)</gadget>
<output>135</output>

<result>135</result>