Congcong reads a story book, read the whole book (4/7) on the first day, and read the rest (3/5) on the second day. At this time, there are still 24 pages to be read. How many pages.
聪聪读一本故事书，第一天读了全书的(4/7)，第二天又读了余下的(3/5)，这时还有24页没读完，这本故事书共有多少页．
<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">(3/7) * (3/5)</gadget>
<output>9/35 = around 0.257143</output>

<gadget id="calculator">1 - (4/7) - (9/35)</gadget>
<output>6/35 = around 0.171429</output>

<gadget id="calculator">24 / (6/35)</gadget>
<output>140</output>

<result>140</result>