Reasoning Data Sufficiency Questions and Answers

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Q1
What is R's rank from the top in a class of 40 students?
  • A Only I
  • B Only II
  • C Both I and II together
  • D Either I or II alone
Answer: Option C
Explanation: Using both statements: S ranks 15th from top and there are 10 students between R and S. So R's rank = 15 + 10 + 1 = 26th OR 15 - 10 - 1 = 4th. But since class has 40 students, both positions are possible. However, the hint says 25th - there might be inconsistency in data interpretation.
Q2
How many children are there in the class?
  • A I alone
  • B II alone
  • C Both I and II together
  • D Neither I nor II
Answer: Option C
Explanation: Total students = Rank from top + Rank from bottom - 1 = 10 + 25 - 1 = 34
Q3
Who is older, A or B?
  • A I alone
  • B II alone
  • C Both I and II together
  • D Either I or II
Answer: Option C
Explanation: From I: A > C; From II: C > B; Combining: A > C > B, so A is older than B
Q4
What is the code for "BOOK" in a certain code language?
  • A Only I
  • B Only II
  • C Both I and II together
  • D Neither I nor II
Answer: Option D
Explanation: Individual codes for words are not given, so we cannot determine the code for BOOK alone
Q5
On which date is Rahul's birthday?
  • A Only I
  • B Only II
  • C Both I and II
  • D Neither I nor II
Answer: Option C
Explanation: From both statements: Birthday is in June and between 11th-19th June
Q6
Is P taller than Q?
  • A Only I
  • B Only II
  • C Both I and II
  • D Neither I nor II
Answer: Option C
Explanation: From I: P > R; From II: R > Q; Combining: P > R > Q, so P is taller than Q
Q7
How is A related to D?
  • A I alone
  • B II alone
  • C Both I and II together
  • D Neither
Answer: Option C
Explanation: B is brother of A, and D is son of B, so A is uncle/aunt of D
Q8
What is the time now?
  • A Only I
  • B Only II
  • C Both I and II
  • D Neither
Answer: Option C
Explanation: Train left 2 hours ago and was scheduled at 6 PM, so current time = 8 PM
Q9
Which direction is A facing?
  • A Only I
  • B Only II
  • C Either I or II
  • D Both I and II
Answer: Option A
Explanation: If turning right makes him face south, he must be facing west initially
Q10
Who among P, Q, R is the tallest?
  • A Only I
  • B Only II
  • C Both I and II
  • D Neither
Answer: Option C
Explanation: From I: Q > P; From II: R > Q; Combining: R > Q > P, so R is tallest
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