Answer: there are 8 key chains Ella can buy.
Explanation:
Since we have given that
Ella bought some key chain and spent a total of 24.
Each key chain cost the same whole dollar amount she bought between 7 and 11 key chains.
As we know that between 7 and 11, there is only 1 number which is factor of 24 i.e. 8
Hence, there are 8 key chains Ella can buy.