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      Question

      What number should be subtracted from both the terms of

      the ratio 17 : 21 so as to make it as 1 : 2 ?
      A 12 Correct Answer Incorrect Answer
      B 13 Correct Answer Incorrect Answer
      C 14 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer

      Solution

      Required number = x =`(17-x)/(21-x)=1/2` โ‡’ 34 - 2x ย = 21 - x โ‡’ 2x - x ย = 34 - 21 โ‡’ x ย = 13

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