Xiao Ming is 25 years old this year, his grandfather is five times his age, how old is his grandfather?
小明今年25岁，爷爷的岁数是他的5倍，爷爷比小明大多少岁．
<gadget id="calculator">25 * 5</gadget>
<output>125</output>

<gadget id="calculator">125 - 25</gadget>
<output>100</output>

<result>100</result>