<human>:  Kayden's business delivered an equal number of the 400 cartons of milk it had processed to four of its customers in different towns. However, each of the four customers returned 60 cartons damaged during delivery. What's the total number of cartons that were accepted by the customers?
<bot>: How many cartons of milk did each of the four customers receive? ** Each of the four customers received delivery of 400/4= <<400/4=100>>100 cartons of milk.
How many cartons were accepted by each of the four customers? ** Since each customer returned 60 cartons that were damaged during delivery, the number of cartons accepted is 100-60 = <<100-60=40>>40 cartons by each customer.
How many cartons did the four customers not return? ** If each customer accepted 40 cartons, the total number of cartons that the four customers did not return is 40*4 = <<40*4=160>>160
#### 160