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Anak = Y
A = 4y
A + 5 = 3( y + 5)
A + 5 = 3y + 15
4y + 5 = 3y + 15
Y = 10
A = 4y
A = 4.10 = 40
Umur ayah = 40 thn
Umur anak = 10 thn