Answer:
1, 2, 4, 8
Explanation:
Find the all the common factors of 24 and 16.
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 16: 1, 2, 4, 8, 16
The common factors are 1, 2, 4, and 8.
If he uses 1 shelf, he'll have 24 novels and 16 autobiographies in a single shelf.
If he uses 2 shelves, he'll have 12 novels and 8 autobiographies per shelf.
If he uses 4 shelves, he'll have 6 novels and 4 autobiographies per shelf.
If he uses 8 shelves, he'll have 3 novels and 2 autobiographies per shelf.