Operator mapping — P = “÷”, Q = “×”, R = “+”, S = “−”. Evaluate the expression: 18 Q 12 P 4 R 5 S 6

Introduction / Context:
Map each code to its arithmetic operator and compute. Be careful to resolve multiplication and division before addition and subtraction.

Given Data / Assumptions:

• P → ÷
• Q → ×
• R → +
• S → −
• Expression intended: 18 Q 12 P 4 R 5 S 6 → 18 × 12 ÷ 4 + 5 − 6

Concept / Approach:
Compute × and ÷ from left to right, then apply + and −.

Step-by-Step Solution:

Verification / Alternative check:
You can group the first two operations: (18 × 12) ÷ 4 = 216 ÷ 4 = 54; then adjust with +5 and −6.

Why Other Options Are Wrong:

• 59/63/65 result from ignoring precedence or misreading one of the mappings.

Common Pitfalls:

• Mistaking “P” for plus; here P actually denotes division.

Final Answer:
53