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Study the following information carefully and answer the question given below: Eight persons namely J, K, L, M, N, O, P and Q are living in an eight-floor building with the bottommost floor being the first floor and the topmost floor being the eighth floor. Only one person stays on one floor. All of them belong to the same family and there are only two married couples, but they have different blood groups, i.e. AB+, AB-, O-, B-, A+, O+ and B+. Each of them participated and obtained different grades in a competitive exam, viz. A, B, C, D, E, F, G and H, but not necessarily in the same order. The grading is done in alphabetical order on the basis of marks, with the top scorer obtaining A grade and the lowest scorer being given H grade. L's maternal aunt does not live on the eighth or first floor. The person who is the third lowest scorer lives on the fifth floor. K is the wife of Q and she has only one child. The person who scored sixth highest marks does not have B- blood group. The person whose blood group is AB- lives on an even-numbered floor. The person whose blood group is O- is an unmarried brother of Q. O is the sister-in-law of Q. L's grandmother has only one brother. The person whose blood group is AB+ lives on the top floor. The third highest scorer lives between K and L's grandmother. O obtained B grade and M's husband's brother-in-law scored the highest marks. M is the mother of Q. The person who obtained G grade has O- blood group and does not stay on the fifth floor. The person whose blood group is A+ lives on the seventh floor. N is the father of J, who is the uncle of L. K's father-in-law obtained E grade and lives on the sixth floor. The person who obtained D grade has A- blood group and lives on the third floor. The person who scored the lowest marks lives on the first floor. Q's child and the one whose blood group is B+ live on an even-numbered floor. L's grandmother obtained F grade and L's uncle is the second lowest scorer. L does not have AB- blood group. Q48. Who amongst the following lives on an even-numbered floor below the person whose blood group is O+?

1. Q
2. The one whose blood group is A-
3. The one who obtained F grade
4. The one who obtained C grade

Correct answer: The one who obtained F grade

Solution

This is a multi-constraint floor arrangement involving family relations, blood groups, and grades. After placing the fixed clues, the person with O+ blood group is determined, and the only person who fits the condition of living on an even-numbered floor below that person is the one who obtained F grade. Hence, that option is correct.

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