Xiaoming asked grandpa's age, and grandpa said: "My age is 6 times your present age, 5 times your age in a few years' time, 4 times your age in a few years' time, and your age in a few years' time 3 times of yours, and 11 times of yours in the past few years, and 13 times of yours in the past few years, then you are still in kindergarten." So how old is Xiao Ming now.
小明问爷爷的年龄，爷爷说："我现在的年龄是你现在年龄的6倍，过几年以后是你的5倍，又过几年后是你的4倍，又过几年后是你的3倍，而前几年是你的11倍，再往前几年是你的13倍，那么你还在幼儿园呢"，那么小明现在的年龄是多少岁．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>