Dad bought a watermelon, cut (1/3) and gave it to Xiaoqiang, and mom only ate the rest (1/3), how much of the watermelon did mom eat?
爸爸买回一个西瓜，切了(1/3)分给小强，妈妈只吃了剩下的(1/3)，妈妈吃了这个西瓜的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(2/3) * (1/3)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>