My younger sister is 12 years old this year, which is (2/3) the age of my brother. How old is my brother this year?
妹妹今年12岁，是哥哥的年龄的(2/3)，哥哥今年多少岁．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 / (2/3)</gadget>
<output>18</output>

<result>18</result>