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RBI Assistant 2017 · Question 129 of 200

Direction: Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer: There are two cylindrical rollers - bigger and smaller. How many rotations will the bigger roller take to flatten a stretch of land (X)? Statement I: The respective ratio of the radii of the bigger and the smaller roller is 7:3. Both the rollers are of the same length. Statement II: The smaller takes 63 rotations to flatten the stretch of land (X).

Mixture and Alligation

  1. AEither I or II
  2. BNeither I nor II
  3. COnly II
  4. DOnly I
  5. EBoth are requiredCorrect

Answer: E. Both are required

Explanation

From both the statements, Radius of the larger roller = 7x units Radius of the smaller roller = 3x units Area flattened by smaller roller in 63 rotations = 2 ∏ × 3x × 1 × 63 Therefore, 2 ∏ × 3x × 63 = 2 ∏ × 7x × 7 x = 27

Source: RBI Assistant 2017 Mains Previous Year Paper (ixamBee solved PDF) · memory-based

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