Xiao Ming and Xiao Liang bought a bottle of Coke, Xiao Ming drank (2/7), Xiao Liang drank (1/7), how much of the bottle of Coke did they drink?
小明和小亮买一瓶可乐，小明喝了(2/7)，小亮喝了(1/7)，他俩一共喝了这瓶可乐的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(2/7) + (1/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>