The son's age is mother's (6/17), mother's age is father's (17/19), son is 12 years old, how old is father?
儿子的年龄是妈妈的(6/17)，妈妈的年龄是爸爸的(17/19)，儿子今年12岁，爸爸有几岁？
<gadget id="calculator">6 / 17</gadget>
<output>6/17 = around 0.352941</output>

<gadget id="calculator">17 / 19</gadget>
<output>17/19 = around 0.894737</output>

<gadget id="calculator">12 / (6/17) / (17/19)</gadget>
<output>38</output>

<result>38</result>