The younger brother Xiaodong is 10 years old this year. Eight years later, the combined age of the younger brother Xiaodong and the older brother will be 41. How old is the older brother?
弟弟小东今年10岁，8年后弟弟小东与哥哥的年龄合起来是41岁，哥哥今年多少岁？
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">41 - 16 - 10</gadget>
<output>15</output>

<result>15</result>