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4 : 3 :1
arif - andy = 21 tahun
maka
arif = 4/(4-1) x 21 = 4/3 x 21 =4 x 7 tahun = 28 tahun
anshar = 3/(4-1) x 21 = 3/3 x 21 = 21 tahun
Andy = 1/(4-1)x 21 = 1/3 x 21 =7 tahun