Reasoning: How to Solve Coded Blood Relations - Symbolic or Mathematical Coding of Relationships

Introduction "Mastering Coded Blood Relations can fetch you 10-15 marks in a single question, making it a must-know topic for cracking competitive exams like SSC, Banking, and Railway."

WHAT YOU NEED TO KNOW FIRST To solve Coded Blood Relations, you need to have the following basic concepts on your fingertips:

1. Direction Chart: A simple chart to represent the relationships between family members (e.g., father, mother, son, daughter, brother, sister).
2. BODMAS: A mnemonic to remember the order of operations (Brackets, Orders, Division, Multiplication, Addition, and Subtraction).
3. Sitting Arrangement Conventions: Understanding how people are seated in a room (e.g., clockwise, anticlockwise, or random).

CRYSTAL‑CLEAR METHOD (Step‑by‑Step) To solve Coded Blood Relations, follow these steps:

1. Read the question carefully: Understand the relationships between family members and the coding used.
2. Identify the coding: Look for patterns or symbols used to represent relationships (e.g., +, -, x, /).
3. Create a direction chart: Draw a chart to represent the relationships between family members.
4. Apply the coding: Use the identified coding to fill in the relationships on the direction chart.
5. Solve the question: Use the completed direction chart to answer the question.

WORKED EXAMPLES

Example 1 – Easy

Question: In a family, A is the father of B, and B is the mother of C. If A is 40 years old, how old is C?

Step-by-Step Reasoning:

1. Read the question carefully: A is the father of B, and B is the mother of C.
2. Identify the coding: None, just a simple family relationship.
3. Create a direction chart: A (father) → B (mother) → C (child)
4. Apply the coding: Since A is 40 years old, and B is the mother of C, B's age is not relevant. C's age is the same as B's, which is not given. However, we can infer that C is the child of B, and A is the father of B.
5. Solve the question: Since A is 40 years old, and C is the child of B, we cannot determine C's age directly. However, we can infer that C is younger than B, and B is younger than A.

What we learned: Even without coding, we can use family relationships to solve questions.

Example 2 – Medium

Question: In a family, A is the mother of B, and B is the sister of C. If A is 35 years old, and C is 5 years older than B, how old is C?

Step-by-Step Reasoning:

1. Read the question carefully: A is the mother of B, and B is the sister of C.
2. Identify the coding: None, just a simple family relationship.
3. Create a direction chart: A (mother) → B (sister) → C (brother)
4. Apply the coding: Since A is 35 years old, and C is 5 years older than B, we need to find B's age first.
5. Solve the question: Since B is the sister of C, and C is 5 years older than B, we can infer that C's age is 5 years more than B's age. Let's assume B's age is x. Then, C's age is x + 5. Since A is 35 years old, and B is the sister of C, we can infer that B's age is not relevant. However, we can use the fact that C is 5 years older than B to find C's age.

What we learned: We can use family relationships and simple arithmetic to solve questions with coding.

Example 3 – Exam‑Style

Question: In a family, A is the father of B, and B is the husband of C. If A is 45 years old, and C is 3 years younger than B, how old is C?

Step-by-Step Reasoning:

1. Read the question carefully: A is the father of B, and B is the husband of C.
2. Identify the coding: None, just a simple family relationship.
3. Create a direction chart: A (father) → B (husband) → C (wife)
4. Apply the coding: Since A is 45 years old, and C is 3 years younger than B, we need to find B's age first.
5. Solve the question: Since B is the husband of C, and C is 3 years younger than B, we can infer that C's age is 3 years less than B's age. Let's assume B's age is x. Then, C's age is x - 3. Since A is 45 years old, and B is the husband of C, we can infer that B's age is not relevant. However, we can use the fact that C is 3 years younger than B to find C's age.

What we learned: We can use family relationships and simple arithmetic to solve questions with coding and multiple relationships.

Common Mistakes

MISTAKE → WHY IT HAPPENS → CORRECT APPROACH

1. Ignoring the coding: Why it happens: Students might overlook the coding or assume it's not relevant. Correct approach: Always identify the coding and apply it to the direction chart.
2. Not creating a direction chart: Why it happens: Students might skip creating a direction chart or assume it's not necessary. Correct approach: Always create a direction chart to visualize the relationships.
3. Not applying the coding correctly: Why it happens: Students might misapply the coding or forget to use it. Correct approach: Always apply the coding to the direction chart and use it to solve the question.
4. Not considering multiple relationships: Why it happens: Students might focus on a single relationship and ignore others. Correct approach: Always consider multiple relationships and use them to solve the question.
5. Not using family relationships: Why it happens: Students might overlook the family relationships or assume they're not relevant. Correct approach: Always use family relationships to solve questions.

EXAM TRAPS

Trap → How to Spot it → How to Avoid it

1. Hidden coding: How to spot it: Look for patterns or symbols used to represent relationships. How to avoid it: Always identify the coding and apply it to the direction chart.
2. Misleading information: How to spot it: Look for irrelevant information or contradictions. How to avoid it: Always focus on the relevant information and use it to solve the question.
3. Complex relationships: How to spot it: Look for multiple relationships or complex family structures. How to avoid it: Always break down complex relationships into simpler ones and use family relationships to solve the question.

TIME‑SAVING SHORTCUTS

1. Elimination trick: If you're unsure about the coding, try eliminating options that don't fit the family relationships.
2. Diagram hack: Use a diagram to visualize the relationships and make it easier to solve the question.
3. Family relationship shortcut: Use family relationships to solve questions without coding or complex arithmetic.

1‑MINUTE RECAP "Alright, let's recap the strategy for Coded Blood Relations. First, read the question carefully and identify the coding. Then, create a direction chart and apply the coding. Use family relationships to solve the question, and don't forget to consider multiple relationships. Remember to avoid common mistakes like ignoring the coding or not creating a direction chart. And, always use family relationships to solve questions. With practice and patience, you'll master Coded Blood Relations and crack competitive exams with confidence. Good luck!