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Verified answer
Misalkan tambahan pekerja yang dibutuhkan adalah x orang60 hari 30
---------- = ----
(60-9-6) x + 30
1800
<=> x + 30 = --------
45
x + 30 = 40
x = 10 ----------------------> 40 - 30
Jadi tambahan pekerjanya = 10 orang
^_*