There is an old man who adds 16 to his age this year, divides by 5, subtracts 10, and finally multiplies by 10. He happens to be 100 years old. How old is this old man?
有一位老人，把他今年的年龄加上16，用5除，再减去10，最后用10乘，恰巧100岁，这位老人今年多少岁？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">10 + 10</gadget>
<output>20</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 16</gadget>
<output>84</output>

<result>84</result>