 
 <translate> Each of the four customers received delivery of 400 / 4 = 100 cartons of milk. Since each customer returned 60 cartons that were damaged during delivery, the number of cartons accepted is 100 - 60 = 40 cartons by each customer. If each customer accepted 40 cartons, the total number of cartons that the four customers did not return is 40 * 4 = 160. The final answer: 160. <ibo> Onye ọ bụla n'ime ndị ahịa anọ ahụ natara igbe mmiri ara ehi 400 / 4 = 100. Ebe ọ bụ na onye ahịa ọ bụla weghachiri katọn 60 ndị mebiri emebi n'oge nnyefe, ọnụ ọgụgụ katọn ndị a nabatara bụ 100 - 60 = katọn 40 site n'aka onye ahịa ọ bụla. Ọ bụrụ na onye ahịa ọ bụla anara katọn iri anọ, ngụkọta nke katọn ndị ahụ ndị ahịa anọ ahụ na-eweghachighị bụ 40 * 4 = 160. Azịza ikpeazụ ya bụ: 160. 