Practice Questions: Blood Relationship | Logical Reasoning for CLAT PDF Download

DIRECTIONS for Question 1: Read the following information carefully to answer the question given below it:
(i) ‘X × Y’ means ‘X is the brother of Y’;
(ii) ‘X ÷ Y’ means ‘Y is the father of X’;
(iii) ‘X + Y’ means ‘X is the sister of Y’;
(iv) ‘X – Y’ means ‘X is the mother of Y’;

Q1: Which of the following means 'A is the paternal uncle of K'?
(a) K × P ÷ M × A
(b) K × B ÷ N × A × D
(c) A × L ÷ R × K
(d) Both 1 and 2
Ans: (b)

1. ‘K × P ÷ M × A’ means ‘K is the brother of P whose father is M, who is the brother of A’. Thus, K is the child of M, who is the brother of A. So, A may be the paternal uncle or aunt of K.
2. ‘K × B ÷ N × A × D’ means ‘K is the brother of B, whose father is N, who is the brother of A, who in turn is the brother of D’. Thus, N is the father of K, and A is the brother of N. So, A is the paternal uncle of K.
3. ‘A × L ÷ R × K’ means ‘A is the brother of L whose father is R, who is the brother of K’. Thus, R is the father of A and R is the brother of K. So, K may be the paternal uncle or aunt of A.

DIRECTIONS for questions 2 & 3: 

Read the following information and answer the questions given below it:

P # Q means P is the father of Q

P + Q means P is the mother of Q

P - Q means P is the brother of Q

P * Q means P is the sister of Q

Q2: If A + B # C - D, then A is D's
(a) Father
(b) Grandmother
(c) Sister
(d) Grandfather
Ans: (d)
A + B # C – D means A is the mother of B, who is the father of C, who is the brother of D, i.e., A is grandmother of D.

Q3: Which of the following shows that A is the aunt of E?
(a) A + B - C * D # E
(b) A # B * C + D - E
(c) A * B # C * D - E
(d) A - B + C # D * E
Ans: (c)

• A * B → A is sister of B.
• B # C → B is father of C ⇒ A is aunt of C.
• C * D → C is sister of D ⇒ D is also child of B ⇒ A is aunt of D.
• D - E → D is brother of E ⇒ E is also child of B.

Thus A (sister of B) is the sister of E’s father B ⇒ A is E’s aunt.

Q4: If 'X $ Y' means 'X is father of Y'; 'X # Y' means 'X is mother of Y'; 'X × Y' means 'X is sister of Y', then how is D related to N in N # A $ B × D?
(a) Nephew
(b) Grandson
(c) Granddaughter
(d) Cannot be Determined
Ans: (d)

• N # A ⇒ N is mother of A.

• A $ B ⇒ A is father of B.

• B × D ⇒ B is sister of D ⇒ D is also child of A.

So D is a grandchild of N, but D’s gender isn’t given (could be grandson or granddaughter). 
Hence it cannot be determined

DIRECTIONS for questions 5 & 6: Read the following information and answer the questions given below it:
(i) ‘X × Y’ means ‘X is the father of Y;
(ii) ‘X - Y’ means ‘X is the sister of Y;
(iii) ‘X + Y’ means ‘X is the mother of Y’.
(iv) ‘X ÷ Y’ means ‘X is the brother of Y’.

Q5: In the expression B + D × A ÷ N, how is A related to B?
(a) Granddaughter
(b) Son
(c) Grandson
(d) Granddaughter or Grandson
Ans: (c)
B + D × A ÷ N means B is the mother of D who is the father of A, who, in turn, is the brother of N. 
Thus, A is the son of D, whose mother is B i.e. A is B’s grandson.

Q6: Which of the following represents 'A is son of B'?
(a) A ÷ R - T × B
(b) A + R - T × B
(c) A ÷ M - N × B
(d) B + A ÷ P
Ans: (d)
B + A ÷ P means B is the mother of A who is the brother of P. Hence A is the son of B.Hence, answer is option 4

DIRECTIONS for questions 7 & 8: Read the following information and answer the questions given below it:
(i) ‘X @ Y’ means ‘X is the mother of Y;
(ii) ‘X $ Y’ means ‘X is the husband of Y;
(iii) ‘X # Y’ means ‘X is the sister of Y’.
(iv) ‘X * Y’ means ‘X is the son of Y’.

Q7: M * P @ D $ Q represents what relation of P with Q?
(a) Mother
(b) Father
(c) Mother – in – law
(d) Data Inadequate
Ans: (c)
M * P @ D $  Q means M is the son of P who is the mother of  D
who is the husband of Q i.e. P is the mother of Q’s husband i.e. P is
Q’s mother-in-law.

Q8: Which of the following indicates the relationship 'A is daughter of P'?
(a) P @ B # F * A
(b) P @ B # A * F
(c) A # F * B @ P
(d) A # F * B $ P
Ans: (d)
A # F * B $ P indicates the relationship ‘A is daughter of P’.

DIRECTIONS for question 9 & 10: Read the following information and answer the questions given below it:
(i) ‘X × Y’ means ‘Y is the mother of X;
(ii) ‘X + Y’ means ‘X is the brother of Y;
(iii) ‘X - Y’ means ‘X is the sister of Y’.
(iv) ‘X ÷ Y’ means ‘Y is the father of X’.

Q9: Which of the following definitely means that 'X' is grandson of D'?
(a) X × H ÷ D
(b) A + X × H ÷ D
(c) A – X × H ÷ D
(d) None of these
Ans: (d)
None of the options out of these 3 means 'X' is grandson of D'.

Q10: How is A related to D in A + B – C ÷ D?
(a) Son
(b) Uncle
(c) Niece
(d) Data inadequate
Ans: (a)
A is the brother of B who is sister of C whose father is D. Therefore, A is the son of D.