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Question

A + B means 'A is the father of B'.
A * B means 'A is the sister of B'.
A % B means 'A is the daughter of B'.
A $ B means 'A is the son of B'.
If L % M + N * O $ P, then how is L related to P?

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

Daughter

Solving Blood Relation Reasoning Questions

This question involves understanding the relationships between individuals based on a set of defined codes. We are given an expression and need to determine the relationship between two specific people mentioned in the expression.

Understanding the Blood Relation Codes

Let's first break down the meaning of each code provided:

  • A + B means 'A is the father of B'. This tells us A's gender is male and they are one generation above B.
  • A * B means 'A is the sister of B'. This tells us A's gender is female and they are in the same generation as B. B's gender is not specified by this relation alone.
  • A % B means 'A is the daughter of B'. This tells us A's gender is female and they are one generation below B. B's gender is not specified by this relation alone.
  • A $ B means 'A is the son of B'. This tells us A's gender is male and they are one generation below B. B's gender is not specified by this relation alone.

Analyzing the Expression: L % M + N * O $ P

Now, let's analyze the given expression part by part from left to right to build the family structure:

1. L % M

Based on the code 'A % B means A is the daughter of B', L % M means L is the daughter of M.

  • L is female.
  • M is the parent of L. M's gender is not yet known from this part.
  • L is one generation below M.

2. M + N

Based on the code 'A + B means A is the father of B', M + N means M is the father of N.

  • M is male.
  • M is the parent of N.
  • N is one generation below M.

Combining with the first part (L % M), we know M is the father of L and M is the father of N. This means L and N are siblings.

3. N * O

Based on the code 'A * B means A is the sister of B', N * O means N is the sister of O.

  • N is female.
  • N and O are siblings.
  • N and O are in the same generation. O's gender is not yet known from this part.

Combining with the previous parts, we have M as the father, and L, N are siblings. Now N is the sister of O, which means O is also a sibling of N and L. So, M is the father of L, N, and O.

4. O $ P

Based on the code 'A $ B means A is the son of B', O $ P means O is the son of P.

  • O is male.
  • P is the parent of O. P's gender is not yet known from this part.
  • O is one generation below P.

We already established that M is the father of O. Now we know O is also the son of P. For O to have two parents, one being M (father) and the other being P, M and P must be married, and P must be O's mother.

Building the Family Tree

From the analysis, we can summarize the relationships:

  • M is the father of L, N, and O.
  • N is the sister of O (and L).
  • O is the son of P.
  • M and P are the parents of O. Since M is the father, P must be the mother.
  • Since M and P are parents of O, and M is the father of L and N, and N is the sister of O, it confirms that M and P are the parents of L, N, and O.

The family structure looks like this:

  • Generation 1: M (Male), P (Female) - They are a couple.
  • Generation 2: L (Female), N (Female), O (Male) - They are siblings, children of M and P. (L is daughter of M & P, N is daughter of M & P, O is son of M & P).

Let's use a table to represent the relationships derived:

Relation Part Relationship Derived Gender Determined
L % M L is daughter of M L (Female)
M + N M is father of N M (Male)
N * O N is sister of O N (Female)
O $ P O is son of P O (Male)

Combining these: M is the father of L and N. N is the sister of O. O is the son of P. If M is father of N and O is also a child of M and P, then M and P are parents. Since M is father, P must be mother. Thus, M and P are parents of L, N, and O.

Determining the Relationship of L to P

The question asks how L is related to P.

From our analysis, P is the mother of L (and N and O).

Therefore, L is the daughter of P.

Conclusion

Based on the given codes and the expression L % M + N * O $ P, L is the daughter of P.

Revision Table - Blood Relation Analysis

Symbol Relationship Gender of 1st Person
+ Father of Male
* Sister of Female
% Daughter of Female
$ Son of Male

Additional Information - Types of Blood Relation Questions

Blood relation questions in reasoning tests typically fall into a few categories:

  • Puzzle-based: A passage describes relationships between several people, and you need to deduce the relationship between two individuals.
  • Code-based: Relationships are represented by symbols or codes, like in this question. You need to decode the expression to determine relationships.
  • Dialogue/Conversation-based: A person points to another person (in a picture or otherwise) and states relationships, e.g., "His mother is the only daughter of my father." You need to figure out the relationship between the speaker and the person pointed out.

Practicing these different types helps in mastering blood relation concepts for competitive exams.

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Similar Questions

  1. If S - T means that S is the mother of T, S × T means that S is the father of T, S + T means that S is the sister of T, then which of the following expression shows that P is the mother of R?

  2. If A × B means that A is the father of B, A ÷ B means that A is the mother of B, A + B means that A is the brother of B then which of the following expression shows that P is the paternal grandmother of R?

  3. ‘A @ B’ means ‘A is the husband of B’.

    ‘A & B’ means ‘A is the father of B’.

    ‘A # B’ means ‘B is the son of A’.

    If F & G @ H # I @ J, then how is G related to J?

  4. A - B means ‘A is the mother of B’

    A * B means ‘A is the husband of B’

    A % B means ‘A is the brother of B’

    A $ B means ‘A is the sister of B’

    If I * J - K % L $ M * N, then how is I related to N?

  5. A # B means ‘A is the sister of B’.

    A @ B means ‘A is the son of B’.

    A & B means ‘A is the father of B’.

    A % B means ‘A is the mother of B’.

    If W @ Q % T & Y @ M % K, then how is W related to K?

  6. A # B means ‘A is the brother of B’

    A @ B means ‘A is the son of B’

    A & B means ‘A is the wife of B’

    A % B means ‘A is the mother of B’

    If A % B & C # D @ E, then how is B related to E?

  7. A # B means ‘A is the sister of B’.

    A @ B means ‘A is the son of B’.

    A & B means ‘A is the father of B’.

    A % B means ‘A is the mother of B’.

    If W & Q # T & Y @ M % K, then how is Q related to K?

  8. If A × B means that A is the brother of B, A – B means that A is the sister of B, A + B means that A is the father of B then which of the following expression shows that P is the father of R?
  9. ‘A @ B’ means ‘A is the husband of B’.

    ‘A & B’ means ‘A is the father of B’.

    ‘A # B’ means ‘B is the son of A’.

    If S @ T # P @ Q # R & V, then how is T related to Q?

  10. If X × Y means that X is the mother of Y, X – Y means that X is the father of Y, X ÷ Y means that X is the sister of Y, then which of the following expression shows that P is the paternal grandfather of R?


Important Questions from Coded Blood Relation Problems

  1. If A @ B means A is the son of B, A # B means A is the husband of B and A * B means A is the daughter of B, then what does P @ Q * R # S mean? 

  2. If P $ Q means P is the husband of Q; P ! Q means P is the mother Q and P * Q means P is the daughter of Q, which of the following shows that Z is brother of W's wife, if Z is male?

  3. If P $ Q means P is the brother of Q; P ! Q means P is the mother Q and P * Q means P is the son of Q, which of the following shows that W is brother of Z?

  4. Read the following information carefully and answer the question given below:

    M * N means ‘ M is the sister of N’

    M % N means ‘ M is the father of N’

    M # N means ‘M is the mother of N’

    Which of the following option gives that, M is father of R?

  5. If ‘A + B’ means ‘A is the mother of B’, ‘A - B’ means ‘A is the father of B’, ‘A × B’ means ‘A is the brother of B’, ‘A & B’ means ‘A is the son of B’, then how is M related to K in the expression ‘N − M + T × L & G & K’?

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