Explanation:

Let's decode the given symbols first:

- A + B: B is daughter of A

- A - B: B is sister of A

- A × B: B is husband of A

- A ÷ B: A is father of B

Breakdown the expression: P ÷ R × T + Q - S × U + Z

Let's do it step by step:

1. P ÷ R: P is father of R

2. R × T: T is husband of R

3. T + Q: Q is daughter of T

4. Q - S: S is sister of Q

5. S × U: U is husband of S

6. U + Z: Z is daughter of U

Now, let's link them:

- P is father of R; R (female, since she has a husband T);

- R’s husband is T;

- T and R's daughter is Q;

- Q's sister is S;

- S's husband is U;

- U and S's daughter is Z.

Therefore, R is the mother of Q and S, R is grandmother of Z

Since R is mother of S, and S is mother of Z,

So R is Z's maternal grandmother.

Option 2, Maternal grandmother, is the correct answer.