Xiao Ming reads a book. He reads 85 pages on the first day and 65 pages on the second day. There are still (2/7) left. How many pages are there in this book?
小明看一本书，第一天看了85页，第二天看了65页，还剩(2/7)没有看，这本书有多少页？
<gadget id="calculator">85 + 65</gadget>
<output>150</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">150 / (5/7)</gadget>
<output>210</output>

<result>210</result>