After Xiaogang has read a part of a book, the ratio of the number of pages he has read to the number of pages he has not read is 3:7. If he reads another 16 pages, the ratio of the number of pages he has finished to the number of pages he has not read is 2:3, how many pages does this book have?
一本书小刚看了一部分后，看完的页数与没看完的页数比是3：7，如果再看16页，那么看完的页数与没看完的页数的比是2：3，这本书一共有多少页？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">16 / (1/10)</gadget>
<output>160</output>

<result>160</result>