This year, the ratio of Xiaohua's age to his father's age is 2:7. In another 18 years, the ratio of Xiaohua's age to his father's age will be 1:2. How old is Xiaohua this year?
今年小华的年龄和他父亲的年龄的比是2：7，再过18年，小华的年龄和他父亲的年龄的比将是1：2，小华今年多少岁．
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<result>12</result>