A + B means A is the sister of B, A - B means A is the father of B, A × B means A is the brother of B, A ÷ B means A is the mother of B. What does X - Y + Z mean?

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Accepted Answer

1. $X - Y$ means **X is the father of Y**.
2. $Y + Z$ means **Y is the sister of Z**, so Y and Z share the same parents.
3. If X is father of Y and Y and Z have the same parents, then **X is the father of Z**.
FINAL_ANSWER: a

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