The combined age of the two brothers this year is 55 years old. There was a year when the elder brother was the same age as the younger brother this year. At that time, the older brother was twice as old as the younger brother. How old is the elder brother this year?
兄弟俩今年的年龄和是55岁，曾经有一年，哥哥的年龄与弟弟今年的年龄相同，那时哥哥的年龄正好是弟弟的年龄的2倍，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>