25 years
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1 decade equals 10 years. So 2 decades is equal to 20 years.
2
1 year = 12 months so 2.5 decades = 2.5*10 = 25 years = 25*12 = 300 months!
A decade is 10 years. Since there are 20 years from 1942 to 1962, that would be 2 decades.
2500 years.