Four score years, or eight decades.
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To find how many tenths are equivalent to four-fifths, you can convert four-fifths into tenths. Since four-fifths is equal to 8/10, there are 8 tenths that are equivalent to four-fifths. Therefore, four-fifths is equivalent to 8 tenths.
One is five fifths. Five fifths and four fifths is nine fifths.
10 decades in 1 century
Ten
10 of them.