I read the whole book (1/6) on the first day, and 42 pages on the second day. At this time, the ratio of the number of pages I have read to the number of pages I have not read is 2:3. How many pages does this book have?
第一天看了全书的(1/6)，第二天看了42页，这时已看的与未看的页数之比是2：3．这本书共有多少页？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

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

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/5) - (1/6)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">42 / (7/30)</gadget>
<output>180</output>

<result>180</result>