Xiao Ming reads a story book, read this book on the first day (2/7), read the same amount on the second day as on the first day, what percentage of the book did he read in total in the two days?
小明看一本故事书，第一天看了这本书的(2/7)，第二天看的和第一天同样多，两天一共看了这本书的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/7) + (2/7)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>