Operator remapping — If “+” means “÷”, “−” means “×”, “×” means “+”, and “÷” means “−”, evaluate: 90 + 18 − 6 × 30 ÷ 4

Introduction / Context:Translate each symbol to its true operation, then compute with standard precedence rules. Carefully track each mapping to avoid mistakes.

Given Data / Assumptions:

• “+” → “÷”
• “−” → “×”
• “×” → “+”
• “÷” → “−”

Concept / Approach:Replace first, then evaluate ×/÷ (i.e., the real operations after mapping), finally do +/−.

Step-by-Step Solution:

Verification / Alternative check:Regrouping as (90 ÷ 18) × 6 + (30 − 4) = 30 + 26 = 56 confirms the result.

Why Other Options Are Wrong:They come from wrong replacements or ignoring precedence.

Common Pitfalls:

• Accidentally treating the original symbols’ positions as changing precedence. They do not.

Final Answer:56