The age of the elder sister 5 years ago is the same as the age of the younger sister 3 years later, what is the age difference between the elder sister and the younger sister?
姐姐5年前的年龄与妹妹3年后的年龄相等，问姐姐和妹妹相差多少岁？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<result>8</result>