The father is 43 years old this year, and the son is 11 years old this year. How many years later will the father be three times the age of the son?
爸爸今年43岁，儿子今年11岁，多少年后爸爸的年龄是儿子的3倍？
<gadget id="calculator">43 - 11</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 - 11</gadget>
<output>5</output>

<result>5</result>