RRB Staff Nurse Kolkata-2015
Reasoning
Medium
If L stands for (+), M stands for (-), N stands for (x) and P stands for (÷), then find the value of: 14 N 10 L 42 P 2 M 8 =?
Appeared in: RRB Staff Nurse Kolkata-2015
Explanation
- The problem requires substituting given letters with mathematical operators and solving the resulting arithmetic expression.
- The expression becomes 14 x 10 + 42 ÷ 2 - 8.
- Applying the BODMAS rule (Division, then Multiplication, then Addition, then Subtraction) is crucial for the correct order of operations.
- Step 1 (Division): 42 ÷ 2 = 21. The expression is now 14 x 10 + 21 - 8.
- Step 2 (Multiplication): 14 x 10 = 140. The expression is now 140 + 21 - 8.
- Step 3 (Addition): 140 + 21 = 161. The expression is now 161 - 8.
Why Other Options Were Wrong
- Option B: This value is incorrect. It may result from an error in calculation or not following the BODMAS rule correctly.
- Option C: This value is incorrect. It likely arises from performing the operations in an incorrect sequence, such as adding before multiplying or dividing.
- Option D: This value is incorrect. It is a result of miscalculation and not adhering to the proper order of operations (BODMAS).
Related Visual
- Visual 1: Flowchart: A flowchart illustrating the BODMAS/PEMDAS order of operations (Brackets/Parentheses, Orders/Exponents, Division/Multiplication, Addition/Subtraction) would be helpful for visualizing the correct sequence.
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mathematical Reasoning (BODMAS Rule) as background academic context rather than a clinical decision trigger.
- While this is a mathematical reasoning question, the underlying skill of following a set order of operations is analogous to following a clinical protocol or a drug calculation formula in nursing.
- Accurate calculation is a critical safety skill for nurses, especially in medication dosage calculations where errors can have serious consequences.
- What if the operations were performed strictly from left to right? The calculation would be 14 x 10 = 140, then 140 + 42 = 182, then 182 ÷ 2 = 91, and finally 91 - 8 = 83. This incorrect result highlights the importance of the BODMAS rule.
How to Approach the Question
- First, carefully read the question to understand the substitution code for each letter (L, M, N, P).
- Replace each letter in the given expression with its corresponding mathematical operator.
- Recall the BODMAS rule, which dictates the correct order of operations: Brackets, Orders (powers/roots), Division, Multiplication, Addition, and Subtraction.
- Systematically solve the expression by performing the operations in the correct BODMAS sequence.
- Perform division and multiplication first (from left to right), followed by addition and subtraction (from left to right).
- Double-check your arithmetic at each step to avoid simple calculation errors and select the matching option.
Concept Tested & Keywords
- Concept Tested: Mathematical Reasoning (BODMAS Rule)
- Stem keywords: L stands for (+), M stands for (-), N stands for (x), P stands for (÷), 14 N 10 L 42 P 2 M 8
- Lead-in keywords: find the value of
Question ID
QYCSVRSbTowOfcDb7C4LsC
Practise the full RRB Staff Nurse Kolkata-2015
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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