When Li Wei reads a book, he reads the whole book on the first day (2/15), and reads 6 more pages on the second day than on the first day. At this time, the ratio of the number of pages read to the number of remaining pages is 3:7 ． How many more pages can Li Wei read to finish this book?
李伟读一本书，第一天读子全书的(2/15)，第二天比第一天多读6页，这时已读的页数与剩下页数的比是3：7．李伟再读多少页能读完这本书？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(3/10) - (2/15) - (2/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">6 / (1/30)</gadget>
<output>180</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">180 * (7/10)</gadget>
<output>126</output>

<result>126</result>