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6 thn sebelumnya umur ali = 3x umur budi
umur ali = 30-6 = 24 thn
umur budi = 1/3 * 24 = 8 thn
umur budi skrg = 8+6 = 14 thn
A umurnya 30
6 th y lalu,
A = 3B
24 = 3B
B = 24/3
B = 8
jadi umur budi 6th yg lalu, 8 th
skrng 8+6 = 14 th