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Verified answer
Perbandingan Berbalik Nilai30 hari ==> 15 orang
30 - 6 = 24 hari ==> 15 orang
24 - 4 = 20 hari ==> n orang
20n = 24 x 15
20n = 360
n = 360/20
n = 18 orang
tambahan pekerja = 18 - 15
= 3 orang (B).
*semoga membantu. sukses selalu ^_^