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Mary is 24 years old She is twice as old as Ann was when she was as old as Ann is now How old is Ann now?
Wiki User
∙ 10y ago
Ann's 18.
We can check this answer easily. Right now, Mary is 24 and Ann is 18. That means that six years ago, Mary was 18 and Ann was 12. In other words, Mary is now twice as old (24) as Ann was (12) when Mary was as old as Ann is now (18).
On the other hand, this is a classic brainteaser from the 1903 New York Times -- so perhaps by now, Ann is actually well over a century old!
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Note that for any given age Mary = M, Ann will be 3/4 as old (3/4 M).
This is the result of the difference being 1/2 of 1/2 of Mary's age.
e.g. if Mary is 60, Ann is 45
So 15 years ago, Mary was 45 and Ann was 30, and Mary at 60 is twice as old as that.
Wiki User
∙ 10y ago
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