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Question

F + M means ‘F is the husband of M’

F ÷ M means ‘F is the daughter of M’

F − M means ‘F is the father of M’

F × M means ‘F is the mother of M’

If U + V × K – B, then how is U related to B?

This question was previously asked in
SSC CGL 2022 Tier-II (Paper 2 JSO) Previous Year Paper (04-Mar-2023)
The correct answer is

Paternal grandfather

Understanding Blood Relations in Reasoning Puzzles

This question involves decoding relationships based on a set of defined codes. We are given an expression U + V × K – B and need to determine how U is related to B using the provided rules.

Decoding the Relationship Codes

Let's break down the given codes:

  • F + M means ‘F is the husband of M’
  • F ÷ M means ‘F is the daughter of M’
  • F – M means ‘F is the father of M’
  • F × M means ‘F is the mother of M’

Analyzing the Expression U + V × K – B

We will analyze the expression step-by-step from left to right:

  1. U + V: According to the first rule, F + M means 'F is the husband of M'. Applying this to U + V, it means ‘U is the husband of V’. This tells us U is male and V is female, and they are a married couple.
  2. V × K: According to the fourth rule, F × M means 'F is the mother of M'. Applying this to V × K, it means ‘V is the mother of K’. This tells us K is the child of V. Since U is V's husband, K is also the child of U.
  3. K – B: According to the third rule, F – M means 'F is the father of M'. Applying this to K – B, it means ‘K is the father of B’. This tells us B is the child of K. Since K is male, B is the child of K and K's partner (whose identity is not needed to find the relation between U and B).

Determining the Relationship between U and B

From our analysis, we have the following relationships:

  • U is the father of K.
  • K is the father of B.

If K is B's father, and U is K's father, then U is B's father's father. The father's father is known as the paternal grandfather.

Final Relationship

Based on the expression U + V × K – B, U is the paternal grandfather of B.

Revision Table: Blood Relation Codes

Code Meaning
+ Husband of
÷ Daughter of
Father of
× Mother of

Additional Information on Blood Relations

Blood relation questions test your ability to understand and decode complex family structures. They often involve symbolic representations of relationships. To solve these types of problems effectively:

  • Carefully read and understand the meaning of each code or symbol provided.
  • Break down the given expression into smaller segments based on the operators (+, –, ×, ÷).
  • Determine the relationship between the two individuals in each segment.
  • Build a step-by-step chain of relationships to connect the two individuals whose relation is asked.
  • Identify the gender of individuals if specified or implied by the relation (e.g., husband is male, mother is female).
  • Use diagrams or family trees if the expression is long or complex, though for simpler ones like this, a linear breakdown is sufficient.
  • Remember common relations like paternal (father's side) and maternal (mother's side).

Practice is key to mastering blood relation problems and improving your speed and accuracy in competitive exams.

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Important Questions from Miscellaneous

  1. The ration of the number of girls and boys in a school is 8 : 7. If the percentage increase in the number of girls and boys is 10% and 20% respectively, what will be the new ratio?

  2. The cheapest means of transport is:

  3. The property of Catenation is most readily predominant in:

  4. Which newspaper edited by Bal Gangadhar Tilak, was one of the strongest critics of the British rule?

  5. Which of the following is NOT a cause of food and water contamination?

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