Xiao Ming is 14 years old this year, and his grandfather is 4 years younger than Xiao Ming, who is 5 times younger than Xiao Ming. How old is grandpa this year?
小明今年14岁，爷爷的年龄比小明的5倍小4岁，爷爷今年多少岁？
<gadget id="calculator">14 * 5</gadget>
<output>70</output>

<gadget id="calculator">70 - 4</gadget>
<output>66</output>

<result>66</result>