A piece of cloth is used to make bed sheets (2/9), and it is used to make curtains (5/9), what percentage of this cloth is used in total?
一块布，做床单用去这块布的(2/9)，做窗帘用去这块布的(5/9)，一共用去这块布的几分之几？
<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>