Custom operators — If S = “−”, Q = “×”, R = “÷”, and P = “+”, evaluate 1 P 45 R 2 Q 2 S 4

Introduction / Context:
Again, symbols are remapped to standard operations. Compute with normal precedence after replacement.

Given Data / Assumptions:

• P → +, R → ÷, Q → ×, S → −.
• Expression: 1 + 45 ÷ 2 × 2 − 4.

Concept / Approach:
Evaluate division and multiplication first, then addition and subtraction.

Step-by-Step Solution:

Verification / Alternative check:
Re-group as (1 + (45 ÷ 2 × 2)) − 4; same result 42.

Why Other Options Are Wrong:

• 40/36/46 arise from left-to-right evaluation ignoring precedence or swapping a mapping.

Common Pitfalls:

• Changing the precedence based on the original letters; precedence follows the real operation after mapping.

Final Answer:
42