Doudou is 4 years old this year, at the age of her mother (2/13). How old is mother this year?
豆豆今年4岁，是妈妈年龄的(2/13)．妈妈今年多少岁？
<gadget id="calculator">2 / 13</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">4 / (2/13)</gadget>
<output>26</output>

<result>26</result>