Xiaohong reads a book. She reads 20 pages on the first day, and reads 2 pages more than the second day. It is known that (1/7) of the whole book is read on the second day. How many pages are there in the whole book?
小红读一本书，第一天读了20页，比第二天多读2页，已知第二天读了全书的(1/7)，全书有多少页？
<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">18 / (1/7)</gadget>
<output>126</output>

<result>126</result>