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30 pekerja -> x hari
x/72 = 25/30
30 x = 72 x 25
30 x = 1800
x = 60 hari
25 => 72 hari
30 => x
25 = x
30 72
30x = 25 x 72
30x = 1800
x = 1800 = 60
30
jadi jika pekerja berjumlah 30 orang maka pekerjaan akan selesai dalam waktu 60 hari.. :)