A big piece of cake, Ming Ming ate (1/6), Yang Yang ate (3/6), how much did they eat in total
一块大蛋糕，明明吃了(1/6)，洋洋吃了(3/6)，共吃了多少
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/6) + (1/2)</gadget>
<output>2/3 = around 0.666667</output>

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