Xiao Ming's father is 42 years old this year, 3 years younger than Xiao Ming's age, how old is Xiao Ming?
小明的爸爸今年42岁，比小明年龄的3倍少3岁，小明今年多少岁？
<gadget id="calculator">42 + 3</gadget>
<output>45</output>

<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<result>15</result>