An old man asked Xiao Ming how old he was, and Xiao Ming replied that he was 12 years old. Xiao Ming asked the old man how old he is this year, and the old man said: "add my age to your age and divide by 3, then subtract 8 and multiply by 5, which happens to be 100 years old." So how old is this old man this year? age.
一位老爷爷问小明多大了，小明回答说12岁．小明又问老爷爷今年多大年龄，老爷爷说："把我的年龄加上你的年龄后除以3，再减去8后用5乘，恰好是100岁．"那么这位老爷爷今年多少岁．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 8</gadget>
<output>28</output>

<gadget id="calculator">28 * 3</gadget>
<output>84</output>

<gadget id="calculator">84 - 12</gadget>
<output>72</output>

<result>72</result>