The image you've uploaded seems to be a puzzle involving concentric circles with numbers. It appears that we are meant to find the missing numbers based on some pattern or rule.

Let's analyze the structure:

• The center has 12.
• The middle circle has 8, 4, and 9 in the left, bottom, and right positions, respectively.
• The outer circle has 18, 24, and 16 at the top, right, and bottom positions, respectively.
• There is a question mark in the upper left of the middle circle, which we need to solve for.

We need to identify a pattern or relationship between these numbers to figure out the missing one. To proceed with this, we can try looking for arithmetic relationships, such as addition or subtraction, between the numbers in each concentric layer.

I will attempt to analyze the potential patterns now and provide a solution.Upon analyzing the arrangement, let's try looking for a relationship between the numbers in each layer.

Consider the middle circle:

• The numbers placed in the middle layer are 8, 4, and 9.
• The outer circle numbers are 18, 16, and 24.

Let's look at the relationship between the numbers in the outer and middle circle:

Attempting Addition and Subtraction Pattern:

1. Top row:

   • $18$ (outer) and $8$ (middle): The difference is $18 - 8 = 10$.

2. Left column:

   • $16$ (outer) and $4$ (middle): The difference is $16 - 4 = 12$.

3. Right column:

   • $24$ (outer) and $9$ (middle): The difference is $24 - 9 = 15$.

This suggests a relationship between the numbers in each layer. So, if we follow the pattern for the upper left position (which has the unknown), we can try subtracting a consistent number.

Let's check the difference that would match the other columns:

• We have $18 - 8 = 10$, $16 - 4 = 12$, and $24 - 9 = 15$.
• The differences increase by 2 each time (10, 12, 15).

If we follow the pattern, for the upper-left number:

• The difference should be $18 - 8 = 10$, so the missing number should follow the pattern where $8$ in the middle circle should have a relationship of $+2$ difference increase. It appears this number would follow.

It seems that the missing number would be 6.

Would you like further details on this approach? Or do you have any additional questions related to this?