The sum of the ages of the two brothers this year is 55 years old. The age of the elder brother in a certain year is the same as the age of the younger brother in this year. In that year, the age of the elder brother is exactly twice the age of the younger brother. How old is the elder brother this year?
今年兄弟二人年龄之和为55岁，哥哥某一年的岁数与弟弟今年的岁数相同，那一年哥哥的岁数恰好是弟弟岁数的2倍，请问哥哥今年多少岁．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">55 / 5</gadget>
<output>11</output>

<gadget id="calculator">11 * 3</gadget>
<output>33</output>

<result>33</result>