If [P @ Q] means "P is the wife of Q", [P + Q] means "P is the father of Q" and [P - Q] means "P is the sister of Q", then in the expression [G + H - R @ D], how is G related to D?

Introduction / Context:
This is a symbolic relation question where different symbols stand for specific family relationships. You are given an expression that combines these symbols and asked to find the relationship between two particular persons, G and D. These problems test careful decoding and stepwise reasoning.

Given Data / Assumptions:

• [P @ Q] means P is the wife of Q.
• [P + Q] means P is the father of Q.
• [P - Q] means P is the sister of Q.
• Expression: G + H - R @ D.
• We assume each pair of symbols is read left to right according to the definitions.

Concept / Approach:
The plan is to decode the expression piece by piece. First interpret G + H, then H - R, then R @ D. After that, connect the roles and generations to locate G and D in the family tree. Finally, compare their positions to decide whether G is a father-in-law, grandfather, brother or something else to D.

Step-by-Step Solution:
Step 1: Decode G + H. The symbol + means "is the father of". So G + H means G is the father of H. Thus G is male and one generation above H.Step 2: Decode H - R. The symbol - means "is the sister of". So H - R means H is the sister of R. Therefore, H is female, and R is her sibling in the same generation.Step 3: Decode R @ D. The symbol @ means "is the wife of". So R @ D means R is the wife of D. Thus R is female, D is male and one generation above any future children they may have.Step 4: Since H is the sister of R, they share the same parents. We already know from Step 1 that G is the father of H. With siblings, it is natural to assume that G is also the father of R.Step 5: If G is the father of R and R is the wife of D, then D is the son-in-law of G, and G is the father-in-law of D.Step 6: The question asks, "how is G related to D?" This is best expressed as G is the father-in-law of D.

Verification / Alternative check:
Assign names for clarity. Let G be Govind, H be Hema, R be Ritu and D be Dev. G + H means Govind is the father of Hema. H - R means Hema is the sister of Ritu, so Govind is also Ritu father. R @ D means Ritu is the wife of Dev. Therefore Dev is the husband of Govind daughter, and Govind is Dev father-in-law. This matches the symbolic decoding.

Why Other Options Are Wrong:
G is not the grandfather of D, because there is no information that G children have children who are D. Instead, D is married to G daughter. G is not D brother, as he is clearly one generation above D partner. G is not D son-in-law, but the reverse is true, and he is not simply an uncle given the direct parent in-law relationship.

Common Pitfalls:
Some learners misread the order and try to decode from the right or mix symbol meanings. It is important to decode each pair in left-to-right order and to track generations carefully. Another common mistake is to treat "sister of" as if it did not imply shared parents; remembering that siblings normally share parents helps you complete the parent links correctly.

Final Answer:
G is related to D as his father-in-law.