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52 = 50.50 + x2.5 dibagi 50+5
52 = 2500 + 5x2 dibagi 55
52.55 = 2500 + 5x2
2860=2500 + 5x2
28600-2500=5x2
360=5x2
Jadi, berat 5 orang anak = 360.
Rata-rata berat 5 orang anak :
=360 : 5
=72