If the year is 1969, four decades later would be 2009. This is because a decade consists of 10 years, so four decades would be 40 years. Adding 40 years to 1969 gives us the year 2009.
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4 decades, 4 years
A decade equals 10 years, so to convert 4 billion years to decades, simply divide by 10.4,000,000,000 years / (10 years/ decade) = 400,000,000 decades.So 4 billion years is 400 million decades
6 decades=60 years so no its not
It is: 40/100 = 2/5 of a century
Oh, what a lovely question! Let's see here. 3 centuries is 300 years, 7 decades is 70 years, and 4 years is, well, 4 years. If we add them all together, we get a total of 374 years. Isn't that just a happy little sum?