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25 years because a century is 100 years and 1/4 of 100 is 25 and it is 69
1/425 years is a 1/4 of a century which is 100 years
4 quarters make a dollar. A single dollar is worth 100 cents. A quarter is 25 cents, 25+25+25+25=100.
Well, honey, a quarter of a century is 25 years. So, if you're trying to do the math in your head, just remember that a century is 100 years, and a quarter of that is 25. Easy peasy lemon squeezy!
100 years = 1 century ⇒ 2500 years = 2500 ÷ 100 centuries = 25 centuries