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Verified answer
A + B = 25A + C = 20
--------------- -
B - C = 5
B = 5 + C
B + C = 31
5 + C + C = 31
2C = 31 - 5
2C = 26
C = 13
B = 13 + 5 = 18
A = 25 - 18 = 7
yang paling tua Bill 18 tahun