model matematik
saat sekarang
2A = R - 2
=> A = 1/2 R - 1
2 tahun yg akan datang
(1/2 R - 1 + 2) +( R + 2) = 30
(1/2R + 1) + (R + 2 ) = 30
3/2 R = 30 - 3 = 27
R = 27 / (3/2) = 27 x 2/3 = 18 Tahun
maka A ( usia ani )
A = 1/2 (18) - 1
9 - 1 = 8 Tahun
semoga membantu
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A + R = 26
2A-R = - 2
eliminasi
A + R = 26
2 A - R = -2
--------------------+
3 A = 24
A= 8
jadi umur ani sekarang 8
model matematik
saat sekarang
2A = R - 2
=> A = 1/2 R - 1
2 tahun yg akan datang
(1/2 R - 1 + 2) +( R + 2) = 30
(1/2R + 1) + (R + 2 ) = 30
3/2 R = 30 - 3 = 27
R = 27 / (3/2) = 27 x 2/3 = 18 Tahun
maka A ( usia ani )
A = 1/2 (18) - 1
9 - 1 = 8 Tahun
semoga membantu