The grain store receives a new batch of rice, the first day sells this batch of rice (2/9), and the second day sells this batch of rice (5/9). How much of this batch of rice was sold in two days?
粮店新进回一批大米，第一天卖出这批大米的(2/9)，第二天卖出这批大米的(5/9)．两天一共卖出这批大米的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(2/9) + (5/9)</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>