UPSC Prelims 2019·CSAT·Logical Reasoning·Deductive Logic

Directions for the following 2 (two) items: Read the following statements SI and S2 and answer the two items that follow: S1: Twice the weight of Sohan is less than the weight of Mohan or that of Rohan. S2: Twice the weight of Rohan is greater than the weight of Mohan or that of Sohan. Which one of the following statements is correct?

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  1. AWeight of Mohan is greatest
  2. BWeight of Sohan is greatest
  3. CWeight of Rohan is greatest
  4. DWhose weight is greatest cannot be determinedCorrect

Explanation

Let S, M, and R be the weights of Sohan, Mohan, and Rohan, respectively. Translate the statements into inequalities: S1: "Twice the weight of Sohan is less than the weight of Mohan or that of Rohan." This means: 2S M (Equation 3) AND 2R > S (Equation 4) Analyze the options: 1. Is Sohan's weight greatest (Option B)? From Equation 1 (2S M: M 20) Then M M 25. Let M = 30. Check all conditions with S=10, M=30, R=25: 2S M (50 > 30) - True 2R > S (50 > 10) - True In this scenario, M (30) is the greatest. So, Option A is possible. Scenario 2: Rohan's weight is greatest. Let S = 10. From 2S M: M 20) Then 25 R > 12.5. Also, we need R > 20 (from 2S 25. Let R = 30. Check all conditions with S=10, M=25, R=30: 2S M (60 > 25) - True 2R > S (60 > 10) - True In this scenario, R (30) is the greatest. So, Option C is possible. Since we found valid scenarios where Mohan's weight is greatest (Option A) and where Rohan's weight is greatest (Option C), we cannot definitively determine whose weight is greatest. Therefore, the correct statement is that whose weight is greatest cannot be determined. The final answer is D
Logical Reasoning: Directions for the following 2 (two) items: Read the following statements SI and S2 and answer the two items that follow

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