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Jika jarak anak ke rumah = x
jarak rumah ke menara = 15m
sehingga jarak anak ke menara = x+15
gunakan perbandingan
5(x+15) = 30x
x+15 = 6x
5x = 15
x = 3
sehingga jarak anak ke menara = 3+15 =18m