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ati = A
A + P = 17
(P+5) = 2 (A + 5)
P + 5 = 2A + 10
P = 2A + 5
A + P = 17
A + 2A + 5 = 17
3A +5 = 17
A = 12 : 3
A = 4
umur ati = 4 tahun
usia ati=a
p+a=17
5+p=2a => p-2a=-5
p + a = 17 x2 p + a = 17
2p + 2a = 34 p - 2a = -5
p - 2a = -5 ---------------- -
------------------ + 3a = 22
3p=29 a= 7,3 tahun
p=9,7 tahun
semoga benar, maaf jika salah :)