The younger sister is 6 years old this year, and the elder brother is 11 years old this year. When the elder brother is 16 years old, how old is the younger sister?
妹妹今年6岁，哥哥今年11岁，当哥哥16岁时，妹妹多少岁．
<gadget id="calculator">11 - 6</gadget>
<output>5</output>

<gadget id="calculator">16 - 5</gadget>
<output>11</output>

<result>11</result>