The age of the father this year is 48, and the age of the elder brother is twice that of the younger brother. When the younger brother grows up to the age of the older brother, the age of the father is exactly equal to the sum of the ages of the two brothers. May I ask: How old is the elder brother this year?
今年父亲的年龄是48岁，哥哥的年龄是弟弟的2倍，当弟弟长到哥哥现在的年龄时，父亲的年龄恰好等于兄弟俩年龄之和，请问：今年哥哥多少岁？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">2 + 1 + 1</gadget>
<output>4</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>