Trinity class watered the flower beds, one group watered the flower beds (2/7), and the second group watered the flower beds (4/7). What percentage of the flower beds did the two groups water together? What fraction of the flower bed is the part that is watered less in the first group than in the second group?
三一班浇花坛，一组浇了花坛的(2/7)，二组浇了花坛的(4/7)．两组一共浇了花坛的几分之几？一组比二组少浇的部分是花坛的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>