Grandpa is 69 years old this year, 4 years older than 5 times Xiao Ming's age. How old is Xiao Ming? (Solution of column equation)
爷爷今年69岁，比小明岁数的5倍还大4岁．小明今年几岁？(列方程解)
<gadget id="calculator">69 - 4</gadget>
<output>65</output>

<gadget id="calculator">65 / 5</gadget>
<output>13</output>

<result>13</result>