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Verified answer
40 × 48 = 192012 × 48 = 576
sisa pekerjaan = 1920 - 576 = 1344
sisa hari kerja = 40 - 12 - 4 = 24 hari
pekerjaan yg dapat diselesaikan selama 24 hari = 24 × 48 = 1152 ( artinya butuh tambahan pekerja)
maka, 24 × (48 + n) = 1344
1152 + 24n = 1344
24n = 1344 - 1152 = 192
n = 192 ÷ 24 = 8 orang