The mother is 36 years old this year, and the daughter is 9 years old this year. When the age of the daughter is (2/5) the age of the mother, how old is the daughter?
妈妈今年36岁，女儿今年9岁，当女儿年龄是妈妈年龄的(2/5)时，女儿多少岁？
<gadget id="calculator">36 - 9</gadget>
<output>27</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">27 / (3/5)</gadget>
<output>45</output>

<gadget id="calculator">45 * (2/5)</gadget>
<output>18</output>

<result>18</result>