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  9. Q13

SSC MTS & Havaldar 2023 · Question 13 of 83

If the radius of circle is decreased by 35%, then its area decreases by:

  1. A56 3 4%
  2. B57 2 % 4
  3. C57 1 %
  4. D57 3 4% 4Correct

Answer: D. 57 3 4% 4

Explanation

35% = 7 20 If initial Radius = 20 Final Radius = 20 - 7 = 13 Ratio of radius = 20 : 13 Ratio of Areas = 20² : 13² = 400 : 169 Decrease in Area = 231 % Decrease in Area = 231 400 × 100 = 57 3 4%

Source: SSC MTS 2023 memory-based paper (based on 1st Sep 2023 exam) with solutions, via sscadda.com · memory-based

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