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A+B+C = 60
A= 2/10x60
= 120/10
= 12
B = 3/10x60
= 180/10
= 18
C = 5/10x60
= 300/10
= 30
Jadi umur A = 12 tahun
Umur B = 18 tahun
Umur C = 30 tahun