A bag of chemical fertilizer, use it on the first day (1/9), use it on the second day (4/9), use the same amount on the third day as the first day, share this bag for these three days What percentage of fertilizer?
一袋化肥，第一天用去它的(1/9)，第二天用去它的(4/9)，第三天用去的和第一天同样多，这三天共用去这袋化肥的几分之几？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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

<gadget id="calculator">(1/9) + (4/9) + (1/9)</gadget>
<output>2/3 = around 0.666667</output>

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