 
 <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. <hau> Dare na farko: 320 (a cikin kashi ɗaya cikin huɗu) = 80. 320 - 80 ya yi daidai da 240. Dare na biyu: 240 ((1 / 6) = 40. 240 - 40 = 200. Dare na uku: 200 (~.30) = 60. 200 - 60 = 140 ducks sun rage. Saboda haka, amsar ita ce 140. 