A piece of cloth is used to make a coat (4/9), and it is used to make trousers (3/9). How much of it is used to make jacket and trousers?
一块布做上衣用去它的(4/9)，做裤子用去了这块布的(3/9)．做上衣和裤子一共用去它的几分之几？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) + (1/3)</gadget>
<output>7/9 = around 0.777778</output>

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