The red ball weighs (3/4) kg and the yellow ball weighs (1/9) that of the red ball. What is the total weight of the two balls?
红球重(3/4)千克，黄球的质量是红球的(1/9)，这两个球共重多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(3/4) * (1/9)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(3/4) + (1/12)</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>