(Huaxia Cup) Xiao Ming started reading this book yesterday. After finishing reading yesterday, the number of pages that Xiao Ming has read is the number of pages that he has not read (1/9). He has read 16 more pages today than yesterday. At this time, the number of pages that have been read is 1/3 of the number of pages that have not been read. The question is, how many pages are there in this book? "
(华夏杯)小明是从昨天开始看这本书的，昨天读完以后，小明已经读完的页数是还没读的页数(1/9)，他今天比昨天多读了16页，这时已经读完的页数是还没读的页数的(1/3)，问题是，这本书共有多少页？"
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/4) - (1/10) - (1/10)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">16 / (1/20)</gadget>
<output>320</output>

<result>320</result>