Grandpa is 70 years old this year, and his age is 5 times older than Xiaoming's by 5 years. How old is Xiao Ming?
爷爷今年70岁了，爷爷的年龄比小明的年龄的5倍还大5岁．小明今年几岁？
<gadget id="calculator">70 - 5</gadget>
<output>65</output>

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

<result>13</result>