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itu mah bisa di nalar han.. :D
klo ngk prcaya itung aj.. ;)
budi = b
a + b = 30
a - b = 6
_________ +
2a = 36
andi = 18 tahun
a - b = 6
b = a - 6
b = 18 - 6
budi = 12 tahun.
Semoga membantu :)