Xiao Ming's father is 32 years old this year, and Xiao Ming is 8 years old this year. When Xiao Ming is old, his father's age is exactly twice that of Xiao Ming's age.
小明的爸爸今年32岁，小明今年8岁，当小明多少岁时爸爸的年龄恰好是小明年龄的2倍．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">32 - 8</gadget>
<output>24</output>

<result>24</result>