Xiaoqiao is 11 years old this year, her father is 3 years older than Xiaoqiao's age, and her father's age is exactly twice her brother's. How old is brother next year?
小巧今年11岁，爸爸的年龄比小巧年龄的3倍多3岁，爸爸的年龄正好是哥哥的2倍．明年哥哥几岁？
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>