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model matematikanya :
(A-1) : (B-1) = 2 : 5
berarti :
(A-1) : (B-1) = 2 : 5
5(A-1) = 2(B-1)
5A - 5 = 2B - 2
5A -2B = 5 -2 = 3
satu lagi
(A+4) : (B+4) = 3 : 4
4(A+4) = 3(B+4)
4A + 16 = 3B + 12
4A - 3B = -16 + 12 = -4
jadi ada dua persamaan
5A - 2B = 3
4A - 3B = -4
coba gunakan cara eliminasi, nanti akan didapatkan :
A : 17/7 tahun
B : 32/7 tahun