Xiao Ming reads a novel. He reads the whole book (4/7) on the first day, and the rest (3/5) on the second day. There are still 42 pages left. How many pages does this novel have?
小明读一本小说，第一天读了全书的(4/7)，第二天读了剩下的(3/5)，还有42页没有读，这本小说一共有多少页？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/7) * (2/5)</gadget>
<output>6/35 = around 0.171429</output>

<gadget id="calculator">42 / (6/35)</gadget>
<output>245</output>

<result>245</result>