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Valeria = 5m
Gretchen = 3m
Resolvemos :
2m + 5m + 3m = 30
10m = 30
m = 30/10
m = 3
2m = 2 (6) = 6
5m = 5 (3) = 15
3m = 3 (3) = 9
Solución :
Natalia tiene = 6 años
Valeria tiene = 15 años
Grtchen tiene = 9 años