Mathematical Operations

Symbol-substitution arithmetic — decode which operator each symbol represents, then solve using BODMAS.

📖 ~4 min read 🧠 RRB NTPC / Group D — Reasoning

What This Tests

Standard arithmetic symbols (+, −, ×, ÷) are replaced with unrelated symbols or letters. You must first decode which real operation each symbol stands for, then solve the expression using BODMAS.

Solving Approach

Note the given key exactly (e.g., "A means +", "B means ÷") before touching the expression
Rewrite the entire expression using real symbols first — don't try to calculate with the coded symbols directly
Apply BODMAS normally once the expression is fully decoded

💡 Example: If "P" means ×, "Q" means +, then "8 P 2 Q 4" becomes 8×2+4 = 20

⚠️ Some questions swap two operations (e.g., + means × and × means +) rather than using unrelated symbols — read the key carefully before assuming symbol meanings.

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