In a certain code language,

'A + B' means 'A is the daughter of B',
'A - B' means 'A is the brother of B',
'A × B' means 'A is the wife of B' and
'A + B' means 'A is the father of B'.

How is E related to K if 'E + F - G × H + K'?

1. A

   Mother's brother's wife

2. B

   Father's brother's daughter

3. C

   Mother's brother's daughter

4. D

   Father's brother's wife

Appeared in: RRB Nsg Superintendent -29 April 2025 (Shift-1st)

Explanation

• The expression 'E + F - G × H + K' is decoded step-by-step to establish the family tree.
• The segment 'H + K' means H is the father of K. 'G × H' means G is the wife of H, making G the mother of K.
• The segment 'F - G' means F is the brother of G. Since G is K's mother, F is K's maternal uncle.
• Finally, 'E + F' means E is the daughter of F.
• Combining these facts, E is the daughter of K's maternal uncle, which translates to 'Mother's brother's daughter'.

Why Other Options Were Wrong

• Option A: This option describes F's wife. The expression 'E + F' clearly states that E is the daughter of F, not his wife.
• Option B: This describes a paternal cousin. The relationship is established through K's mother (G), making it a maternal relationship, not a paternal one.
• Option D: This describes the wife of K's paternal uncle. The expression establishes a maternal blood relationship, not a relationship by marriage on the paternal side.

Related Visual

• Visual 1: Flowchart: A family tree diagram illustrating the relationships from K to E based on the decoded expression 'E + F - G × H + K'. This visual helps map out each connection clearly.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning - Coded Blood Relations as background academic context rather than a clinical decision trigger.
• This question is not related to nursing but tests logical and deductive reasoning.
• These reasoning skills are crucial for nurses in clinical problem-solving, such as interpreting patient data, understanding complex care plans, and making sound judgments under pressure.
• What if? If the expression was 'E - F + G × H + K', and '+' meant daughter, then E would be the brother of F, who is the daughter of G. This would make E the maternal uncle of K, changing the answer completely.

How to Approach the Question

• First, carefully read and list all the coded relationships provided. Identify any symbols with multiple meanings, such as the '+' symbol in this question.
• Analyze the given expression ('E + F - G × H + K'). It's often easiest to work from right to left to establish a base relationship and build upon it.
• Use logical constraints to resolve ambiguities. For instance, the fact that 'G' is a wife makes 'H' a male, which clarifies that 'H + K' must mean 'H is the father of K'.
• Draw a simple family tree or diagram as you decode each part of the expression. This helps visualize the connections.
• Once all relationships are mapped, determine the final connection between the two individuals in question (E and K).
• Compare your derived relationship with the given options to find the correct match.

Concept Tested & Keywords

• Concept Tested: Logical Reasoning - Coded Blood Relations
• Stem keywords: code language, A + B, A - B, A × B, E related to K
• Lead-in keywords: How is
• Negative lead-in flag: false

Question ID

QMARc-0dC_F1yTR562nCB0

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