Two days to read a story book. I read this book on the first day (5/13), how much more of this book should I read on the second day than on the first day?
两天要看完一本故事书．我第一天看了这本书的(5/13)，第二天要比第一天多看这本书的几分之几？
<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">1 - (5/13) - (5/13)</gadget>
<output>3/13 = around 0.230769</output>

<result>3/13 = around 0.230769</result>