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10/15 + 3/15 + x = 1
13/15 + x = 1
x = 1 - 13/15 = 2/15
= 1 - 2/3 - 1/5
= 15/15 - 10/15 - 3/15
= 15/15 - 13/15
= 2/15 bagiannya adalah anak-anak.
misal jumlah orang di sana adalah x
2/3x = 48 + 2/15x
2/3x - 2/15x = 48
10/15x - 2/15x = 48
8/15x = 48
8x = 48*15
8x = 720
x = 720/8
x = 90 orang.