Maria ma 24 lata, a jest ona dwukrotnie starsza niż była Anna wtedy, gdy Maria miała tyle lat ile teraz ma Anna. Ile lat ma Anna ?
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a - Anna
m - Maria
2a - m --> wiek Anny wtedy, gdy Maria miała tyle lat ile teraz ma Anna.
m = 24
m = 2(2a - m)
m = 4a - 2m
3m = 4a
3*24 = 4a
72 = 4a
a = 18