1 because a decade is ten years so 15 is 1 decade and 5 years
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12.2 years = 1.22 decades
16 decades and 4 years.
There are 10.6 decades. Or 10 decades plus 6 years.
1.5 decades (15 years does not have a specific name for that period of time.)
1 decade = 10 years 17 decades = 170 years