A pile of coal is transported away on the first day (3/7), and transported away on the second day (2/7), what percentage is transported in total in two days?
一堆煤，第一天运走(3/7)，第二天运走(2/7)，两天一共运走几分之几？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

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

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