Mother is younger than father (1/12), and father is 3 years older than mother. What is mother's age?
妈妈的年龄比爸爸少(1/12)，爸爸比妈妈大3岁，妈妈的年龄是多少？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">3 / (1/12)</gadget>
<output>36</output>

<gadget id="calculator">36 - 3</gadget>
<output>33</output>

<result>33</result>