The little rabbit pulled out a basket of radishes, and it gave (2/7) of this basket of radishes to grandma, and the same amount was given to grandma as to grandma. How much of this basket of radishes did Xiaotu send away?
小兔拔了一筐萝卜，它把这筐萝卜的(2/7)送给奶奶，送给外婆的和送给奶奶的同样多．小兔一共送走这筐萝卜的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/7) + (2/7)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>