Final answer:
The delivery person can bring up a maximum of 13 boxes of books at one time.
Step-by-step explanation:
To determine how many boxes of books the delivery person can bring up at one time, we need to consider the weight of the delivery and each box of books, as well as the maximum capacity of the elevator. The delivery person weighs 160 lb. Each box of books weighs 60 lb. The maximum capacity of the elevator is 1470 lb.
To find the number of boxes, we can subtract the weight of the delivery person from the maximum capacity of the elevator and divide the result by the weight of each box: (1470 - 160) / 60 = 13.5. Since we cannot have a fraction of a box, the delivery person can bring up a maximum of 13 boxes of books at one time.