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42 hari
x = 30 hari
x = 30/42 × 20
x =28 pekerja
a orng => 30 hari
jawab :
20 . 42 = a . 30
840 = a . 30
a = 840 : 30
a = 28 pekerja
jadi yg dibutuhkan dlm 30 hari = 28 pekerja