If 'A' stands for '÷', 'B' stands for 'x', 'C' stands for '+' and 'D' stands for '-', what will come in place of the question mark '?' in the following equation? 6 B 2 D 14 A 7 C 2 - ?

1. A

   8

2. B

   10

3. C

   12

4. D

   14

Appeared in: RRB Nsg. Superintendent-2026 (Shift -2nd)

Explanation

• The core task is to substitute letters with mathematical operators and solve the resulting arithmetic expression.
• The given equation is 6 B 2 D 14 A 7 C 2.
• Substituting the operators gives: 6 x 2 - 14 ÷ 7 + 2.
• Following the BODMAS rule, division (14 ÷ 7 = 2) and multiplication (6 x 2 = 12) are performed first.
• The expression simplifies to 12 - 2 + 2.
• Solving from left to right, 12 - 2 = 10, and 10 + 2 = 12.

Why Other Options Were Wrong

• Option A: This result is incorrect. It may be obtained by performing the addition (2+2=4) before the subtraction (12-4=8), which violates the left-to-right rule for addition and subtraction.
• Option B: This result is incorrect. It occurs if the final step of adding 2 is missed (12 - 2 = 10).
• Option D: This result is incorrect. It might be obtained by incorrectly prioritizing addition over subtraction, for example, by ignoring the subtraction sign (12 + 2 = 14).

Related Visual

• Visual 1: Flowchart: A flowchart illustrating the BODMAS order of operations (Brackets -> Orders -> Division/Multiplication -> Addition/Subtraction) to visually guide the calculation steps.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain This question tests mathematical reasoning and the application of the BODMAS rule as background academic context rather than a clinical decision trigger.
• While not a clinical question, this type of logical reasoning problem assesses critical thinking and attention to detail, which are essential skills for nurses.
• Nurses must accurately follow protocols and sequences in procedures and medication administration, similar to following the order of operations in mathematics.
• What if? If the rule was to solve strictly from left to right, ignoring BODMAS, the calculation would be: 6 x 2 = 12; 12 - 14 = -2; -2 ÷ 7 ≈ -0.28; -0.28 + 2 = 1.72. This highlights the importance of following the established BODMAS convention.

How to Approach the Question

• First, carefully read the instructions to map each letter (A, B, C, D) to its corresponding mathematical operation (÷, x, +, -).
• Rewrite the given equation, replacing each letter with its assigned operator.
• Recall the BODMAS rule to determine the correct order of operations: Brackets, Orders, Division, Multiplication, Addition, Subtraction.
• Systematically solve the new equation. Perform division and multiplication first, moving from left to right.
• Then, perform addition and subtraction, also moving from left to right.
• Finally, compare your calculated result to the given options to find the correct answer.

Concept Tested & Keywords

• Concept Tested: This question tests mathematical reasoning and the application of the BODMAS rule.
• Stem keywords: A stands for ÷, B stands for x, C stands for +, D stands for -, equation
• Lead-in keywords: what will come in place of the question mark

Question ID

Qw70rmsovatiGBm0ah60oS

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