This year Xiaoming's age is three times that of Xiaohong's, and after 3 years Xiaoming's age is twice that of Xiaohong's. How old is Xiaohong this year?
今年小明的年龄是小红的3倍，3年后小明的年龄是小红的2倍，小红今年多少岁．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 3</gadget>
<output>3</output>

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

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

<result>3</result>