Xiao Ming reads a book, read this book on the first day (2/9), and read this book more on the second day than on the first day (1/6). How many times did he read this book in two days? How much?
小明看一本书，第一天看了这本书的(2/9)，第二天比第一天多看这本书的(1/6)，两天一共看了这本书的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/9) + (1/6)</gadget>
<output>7/18 = around 0.388889</output>

<gadget id="calculator">(2/9) + (7/18)</gadget>
<output>11/18 = around 0.611111</output>

<result>11/18 = around 0.611111</result>