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2 jam = 240
240 : 20 x 15 x 2 = 360 Bakteri
Semoga membantu ya
setiap 1 jam = 6 bakteri
jam 9 - 11 = 2 jam
bakteri pada awalnya sudah berjumlah 15
Jadi,
15 + ( 6 X 2 )
15 + 12 = 27