Dad is 36 years old this year, 3 years younger than 3 times Xiao Ming's age. How old is Xiao Ming? (column equation solution)
爸爸今年36岁，比小明年龄的3倍少3岁，小明今年多少岁？(列方程解答)
<gadget id="calculator">36 + 3</gadget>
<output>39</output>

<gadget id="calculator">39 / 3</gadget>
<output>13</output>

<result>13</result>