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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, and A ÷ B means A is the mother of B. What does X - Y + Z mean?

1. X is Z’s father
2. Y is Z’s daughter
3. X is Z’s grandfather
4. Z is X’s daughter

Correct answer: X is Z’s father

Solution

X - Y means X is the father of Y. Y + Z means Y is the sister of Z, so Y and Z are siblings. Therefore, X is also the father of Z.

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