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3:4 x 12=36:48
Usia B : 48
4A = 3B
A = (3/4)B
(A - 6) : (B - 6) = 5 : 7
7A - 42 = 5B - 30
7A - 5B = 12
substitusi:
(21/4)B - 5B = 12
(1/4)B = 12
B = 48 tahun