To find the missing number, let's analyze the relationships between the numbers in the given table:

Observe the relationship between the numbers in each row. Notice that in the first row, \(10 = 7 + 3\) and \(5 = 7 - 2\). In the second row, \(40 = 16 \times 2.5\) and \(8 = 16/2\). This pattern suggests that there is a different relationship between the numbers in each row.

Let's try a different approach. Let's consider the columns. In the first column, we have 7, 16, and 15. The differences are not immediately obvious. Let's move to the third column: 5, 8, 9. The differences are not consistent either.

Let's examine the product of the first and third columns. In the first row, \(7 \times 5 = 35\). In the second row, \(16 \times 8 = 128\). There is no clear relation between 35 and 128. Let's try another approach: find the relationship between the numbers in each row. Looking at the first and third columns separately doesn't reveal an obvious pattern. However, let's consider the ratio between the numbers in each row.

In the first row: \(10/7 \approx 1.43\) and \(5/7 \approx 0.71\). In the second row: \(40/16 = 2.5\) and \(8/16 = 0.5\). This does not provide a consistent pattern. Let's explore the relationships between the numbers in a different way. Let's look for a pattern across the rows and columns that works consistently.

Let's consider the relationship between the first and second column. In the first row, \(10 = 7 + 3\). In the second row, \(40 = 16 \times 2.5\). Let's analyze the relationship between the second and third column. In the first row, \(10 = 2 \times 5\). In the second row, \(40 = 5 \times 8\).

Analyzing the second and third columns reveals a consistent pattern. In each row, the second number is the product of the third number and a specific factor. Let's apply this logic to the third row: \(9 \times x = ?\), where x is the scaling factor. Let's assume this scaling factor is consistent across all rows. Let's look at the second column: 10, 40. 40/10 = 4. This suggests the scaling factor may not be consistent. Let's reconsider.

Let's look at the second row. If we assume \(16 \times 2.5 = 40\), and \(16/2 = 8\), we have to find a similar relationship for the third row. If we take the third row: \(15 \times 2 = 30\) and \(15/1.667 = 9\).

Therefore, the missing number is 30.