If A:B=1:3, B:C=5:7, C:D=9:7, then A:B:C:D=?

  1. 15:45:63:49
  2. 15:49:45:63
  3. 45:15:63:49
  4. 49:15:45:63
vijay Professor Asked on 2nd August 2015 in Maths.
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  • 1 Answer(s)

    Answer: (1) 15 : 45 : 63 : 49
    Explanation:-
    A : B = 1 : 3, B : C = 5 : 7, C : D = 9 : 7
    Formula-
    A : B = a : b, B : C = b : c, C : D = c : d
    Then, A : B : C : D = a x b c : b x b x c : b x c x c : b x c x d
    Then, The A : B : C : D = 1 x 5 x  9 : 3 x 5 x 9 : 3 x 7 x 9 : 3 x 7 x 7
    = 45 : 135 : 189 : 147
    Taking 3 is a common factor,
    Then, 15 : 45 : 63 : 49.
    Hence, the answer is (1) 15 : 45 : 63 : 49.

    Anurag Mishra Professor Answered on 2nd August 2015.
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