Aunt Zhang harvested a batch of watermelons, and sold (2/9) of the total on the first day, and (4/9) of the total on the second day. What percentage of the total sales?
张阿姨收获了一批西瓜，第一天卖出了总数的(2/9)，第二天卖出了总数的(4/9)．一共卖出总数的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(2/9) + (4/9)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>