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5 ⇒ 20
4 ⇒ x
x = 20 x 5 : 4
= 100 : 4
= 25 hari
----------- = --------------
4 org x
(5 x 20) = 4x
100 = 4x
x = 25 hari
jadi jika dikerjakan 4 org akan selesai dalam 25 hari