For a batch of fruits, those who sold this batch of fruits on the first day (2/11), those who sold this batch of fruits on the second day (5/11), sold the same amount on the third day as the sum of the previous two days. How much of this batch of fruit was sold in three days?
一批水果，第一天卖了这批水果的(2/11)，第二天卖了这批水果的(5/11)，第三天卖出的与前两天的总和同样多，第三天卖了这批水果的几分之几？
<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(2/11) + (5/11)</gadget>
<output>7/11 = around 0.636364</output>

<result>7/11 = around 0.636364</result>