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Q: How many decades are in four fifths of a century?

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There are two fifths in four tenths.

One is five fifths. Five fifths and four fifths is nine fifths.

Its 10. 10 decades = 1 century.

10 decades in 1 century

There are 20 decades.

There are 5 decades in half a century.

Learn your math...JK 6 and four fifths is written like so: 6.4 so two fifths.

There are two fifths in four tenths.

There are 4......

Ten

Ten decades is one century.

four fifths is equal to eight tenths 4/5 = 8/10