Obviously reading a story book, I read (1/5) of this book on the first day, and (3/7) of this book on the second day, what fraction of this book I read in total in two days ?
明明看一本故事书，第一天看了这本书的(1/5)，第二天看了这本书的(3/7)，两天一共看了这本书的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/5) + (3/7)</gadget>
<output>22/35 = around 0.628571</output>

<result>22/35 = around 0.628571</result>