The sum of the ages of the two brothers this year is 55 years old. There was a year when the older brother was the same age as the younger brother this year. At that time, the older brother was exactly twice as old as the younger brother. How old is the older brother this year?
今年兄弟俩年龄之和是55岁，曾经有一年，兄的岁数与今年弟的岁数相同，那时兄的岁数恰好是弟的岁数的2倍，兄今年多少岁．
<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>