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1 decade is 10 years which means 9 decades is 90 years. (10x9)

1 decade= 10 years (10x1)

2 decades= 20 years (10x2)

3 decades= 30 years (10x3)

4 decades= 40 years (10x4)

5 decades= 50 years (10x5)

6 decades= 60 years (10x6)

7 decades= 70 years (10x7)

8 decades= 80 years (10x8)

9 decades= 90 years (10x9)

10 decades= 100 years (10x10)

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9y ago

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