Custom symbols — If Q = “+”, J = “×”, T = “−”, K = “÷”, evaluate: 30 K 2 Q 3 J 6 T 5

Introduction / Context:
Replace each letter with its corresponding arithmetic operation and apply standard precedence rules (division/multiplication before addition/subtraction, with brackets first if any).

Given Data / Assumptions:

• Q → +
• J → ×
• T → −
• K → ÷

Concept / Approach:
Perform replacements and compute in the natural order of operations.

Step-by-Step Solution:

Verification / Alternative check:
Grouping as (30 ÷ 2) + (3 × 6) − 5 also yields 28.

Why Other Options Are Wrong:

• 31 or 18 occur if addition/subtraction is done before handling ×/÷ or if one mapping is misread.

Common Pitfalls:

• Treating letters as variables instead of operator codes.

Final Answer:
28