 <translate> First night:320(1 / 4) = 80. 320 - 80 = 240. Second night:240(1 / 6) = 40. 240 - 40 = 200. Third night:200(.30) = 60. 200 - 60 = 140 ducks remain.
Therefore, the answer is 140. <yor> Ọjọ́ àkọ́kọ́: 320 (ìyẹn 1/4) = 80. 320 - 80 jẹ 240. Alẹ́ kejì: 240 (ìyẹn 1/6) = 40. 240 - 40 = 200. Ọ̀sán kẹta: Ọ̀sán kẹta: Ọ̀sán kẹta 200 - 60 = 140 ni àwọn ìkòkò tó kù. Nítorí náà, ìdáhùn náà ni 140. 