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Verified answer
75 × 21 = 157515 × 21 = 315
1575 - 315 = 1260
n × 18 = 1260
n = 70 hari
70 + 15 = 85 - 75 = 10
penyelesaian pekerjaan mundur 10 hari dari yg diperkirakan (75 hari)