Students origami cranes, Xiaohong folded (2/7) of the total, and Xiaoli (3/7), what percentage of the total folded by the two of them?
同学们折纸鹤，小红折的占总数的(2/7)，小丽折的占总数的(3/7)，两人折的一共占总数的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

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

<gadget id="calculator">(2/7) + (3/7)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>