Xiaoqing reads a story book. On the first day, she reads 24 pages, accounting for 20% of the whole book. On the second day, she reads the whole book (7/20). How many pages are left?
小青读一本故事书，第一天读了24页，占全书的20%，第二天读了全书的(7/20)，还剩多少页没读？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">24 / (1/5)</gadget>
<output>120</output>

<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (1/5) - (7/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">120 * (9/20)</gadget>
<output>54</output>

<result>54</result>