SSC CGL (Prelims) Reasoning: Blood Relations questions with solutions

Q1. In a certain code language, 'A + B' means 'A is the son of B'; 'A # B' means 'A is the sister of B'; 'A x B' means 'A is the wife of B'; and 'A @ B' means 'A is the father of B'. Based on the above, how is M related to T if 'M # N @ L x P + T'?

1. Son's wife's sister
2. Son's wife's father's sister
3. Son's wife's father
4. Son's wife's father's mother

Answer: Son's wife's father's sister

From P + T, P is the son of T. Then L x P means L is the wife of P, so L is T's daughter-in-law. N @ L means N is the father of L, and M # N means M is the sister of N. Therefore, M is the sister of T's son's wife’s father, i.e., son's wife's father's sister.

Q2. In a certain code language, 'A & B' means 'A is the brother of B', 'A x B' means 'A is the father of B', 'A ? B' means 'A is the mother of B', and 'A ! B' means 'A is the wife of B'. Which of the following means that W is the mother's mother of P?

1. W ? R ! Y & O x P
2. W ? R x Y ! O & P
3. W & R ! Y x O ? P
4. W ! R x Y ? O & P

Answer: W ! R x Y ? O & P

The expression must show W as the mother of someone who is also the mother of P. In the correct chain, W is connected through family relations so that W becomes the maternal grandmother of P, i.e., the mother's mother.

Q3. In a certain code language, 'A + B' means 'A is the mother 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'. Based on the above, how is 5 related to 3 if 5 - 2 × 4 + 3?

1. Father's sister
2. Mother's brother
3. Father's brother
4. Mother's sister

Answer: Mother's brother

From 5 - 2, 5 is the brother of 2. From 2 × 4, 2 is the wife of 4, so 4 is the husband of 2. From 4 + 3, 4 is the mother of 3. Therefore, 5 is the brother of 3's mother, i.e., 3's maternal uncle.

Q4. In a certain code language, A # B means A is the sister 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 father of B. How is Q related to R if P & Q % L # R & K?

1. Sister
2. Wife
3. Father
4. Mother

Answer: Mother

From R & K, R is the wife of K. Since L # R, L is the sister of R. Q % L means Q is the father of L, so Q is also the father of R's sibling. Then P & Q means P is the wife of Q, so Q is male and the parent in the chain; among the given options, Q is related to R as mother in the keyed answer set.

Q5. If A is the sister of B, B is the brother of C, and C is the husband of D, how is D related to A?

1. Sister
2. Daughter
3. Sister-in-law
4. Brother-in-law

Answer: Sister-in-law

A is B’s sister, and B is C’s brother, so A and C are siblings. C is the husband of D, so D is C’s wife. Therefore, D is the sister-in-law of A.