Identify the missing number in the following table based on the pattern: | 85 | 20 | 5 | | 126 | 24 | 6 | | 175 | ? | 7 |

Let's look at the relationship between C2 and C3:

• For the first row: $20 = 4 \times 5$
• For the second row: $24 = 4 \times 6$

This suggests a pattern where the number in C2 is 4 times the number in C3.

Let's also check the relationship between C1 and C3 to ensure consistency, although the missing number is in C2.

• For the first row: $85 = 17 \times 5$. We can write $17 = (4 \times 5) - 3$. So, $85 = ((4 \times 5) - 3) \times 5$.
• For the second row: $126 = 21 \times 6$. We can write $21 = (4 \times 6) - 3$. So, $126 = ((4 \times 6) - 3) \times 6$.
• For the third row: $175 = 25 \times 7$. We can write $25 = (4 \times 7) - 3$. So, $175 = ((4 \times 7) - 3) \times 7$.

The pattern for C1 is consistent: $C1 = (4 \times C3 - 3) \times C3$.
The pattern for C2 is also consistent: $C2 = 4 \times C3$.

Using the pattern for C2, where $C2 = 4 \times C3$:
For the third row, C3 is 7.

$$C2 = 4 \times 7$$ $$C2 = 28$$

The missing number is 28.

The final answer is $\text{28}$.