Answer: The number of books on the top shelf is 14.
Step-by-step explanation:
Given : A bookcase has two shelves.
The number of books in the bottom shelf = 12
According to the question,
The number of books on the top self = [tex](\dfrac{1}{3})\times (\text{Number of books on the bottom shelf})+10[/tex]
[tex]=\dfrac{1}{3}\times12+10\\\\=4+10\\\\=14[/tex]
Hence, the number of books on the top shelf is 14.
