story book has 100 pages in total. Xiaohong reads 1/4 of the whole book on the first day and 20 pages on the second day. What fraction of the whole book is left?
一本故事书共100页，小红第一天看了全书的(1/4)，第二天看了20页，还剩全书的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>