Operator re-mapping – evaluate the expression under new symbol meanings: If "+" means "-", "−" means "×", "×" means "÷" and "÷" means "+", then compute the value of: 16 × 2 ÷ 25 + 7 − 4

Introduction / Context:
In operator re-mapping questions, symbols are reassigned new meanings. You must first translate the expression into its true operations and then evaluate with standard operator precedence (× and ÷ before + and −). Careful symbol-by-symbol substitution prevents common mistakes.

Given Data / Assumptions:

• Mapping: "+" → "−", "−" → "×", "×" → "÷", "÷" → "+".
• Expression: 16 × 2 ÷ 25 + 7 − 4.

Concept / Approach:
Translate each symbol first, then compute. Do not mix the original symbols with their new meanings during evaluation; complete translation ensures correct precedence and arithmetic.

Step-by-Step Solution:

Verification / Alternative check:
Re-translate in a second pass to confirm no symbol was missed; recompute to confirm 5.

Why Other Options Are Wrong:

Common Pitfalls:
Attempting to compute while translating on the fly; always finish translation first, then apply normal precedence.

Final Answer:
5