i can't tell you but here's a hint: there are 10 years in a decade so 85 divided by 10 is......(round 85 to 80)
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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 decade = 10 years 17 decades = 170 years
A decade is ten years, so 7 decades in 70 years.