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Verified answer
Jawabperbandingan
75 hari ~~ 21 pekerja
15 hari ..(-)
60 hari ~~ 21 pekerja
x hari ~~(21-3) = 18 pekerja
x = 60 x 21/ 18 hari
x = 70hari
pekerjaab munudr - 70 -60 = 10 hari