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To solve mathematical expressions correctly, follow the VBODMAS priority order:
1. V (Vinculum/Bar): Solve expressions under a bar first.
2. B (Brackets): (), {}, [] in that order.
3. O (Of): Multiplication indicated by 'of'.
4. D (Division): ÷
5. M (Multiplication): ×
6. A (Addition): +
7. S (Subtraction): -
In these problems, actual mathematical signs are replaced by symbols or other signs. Example: If '+' means '×' and '-' means '÷', then 10 + 2 - 4 becomes 10 × 2 ÷ 4.
Some questions require you to swap two signs (e.g., + and -) or two numbers (e.g., 3 and 6) to make an incorrect equation mathematically correct. Always use trial and error starting with division-related options.