Let's break down the exercises in the image and go through them one by one:

Exercise 1:

• You're given three numbers: $X$, $Y$, and $Z$.
• The task is to substitute the numbers given in the grid into the equation $X + Y + Z$.

Grid:

For each row, the equation $X + Y + Z$ should be calculated:

1. First row: $6 + 5 + 4 = 15$
2. Second row: $7 + 9 + 2 = 18$

In the example solved in the worksheet, the equation $X + Y + Z = 109$ seems incorrect. However, let’s focus on the calculations as intended based on the numbers provided.

Exercise 2:

• There are two numbers (presumably X and Y) with the same difference between them and the number 207.

• The subtraction for the second row gives $207 - X = Y$. Using the provided operations, we calculate how this pattern works.

Exercise 3:

• This section asks for finding the rule and filling in the missing values. The following operations are shown:
  1. $(8 - 9) : 2 = 36$
  2. $(99 - 27) : 2 = 36$

The rule is $c = 6$, derived from the consistent results of 36.

Another part of this exercise involves a more complex equation:

• $(56 + 34) : x = 75$

It seems we're solving for the unknown $x$, but I’d need more details on the precise setup.

Would you like me to work through a specific part of the image or verify my interpretation of the task?

Here are five related questions to help you understand this better:

1. What pattern can you identify in the second exercise between the given numbers?
2. How could you generalize the rule used in Exercise 3 for other problems?
3. Can you verify if all calculations for Exercise 1 are correct?
4. How would you approach the last equation in Exercise 3?
5. What other arithmetic patterns might apply to the missing numbers in the puzzles?

Tip: Always check if there is a consistent mathematical relationship between numbers when solving puzzles like these.