This year, the age of the elder sister is three times that of the younger sister. Two years later, the age of the older sister will be twice that of the younger sister. So, this year, what is the age of the elder sister?
今年，姐姐的年龄是妹妹的3倍，2年后，姐姐的年龄将是妹妹的2倍，那么，今年，姐姐的年龄是多少岁．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>