If a : b = 3 : 5 and b : c = 4 : 7, then a : c = ?

  1. 11 : 35
  2. 35 : 11
  3. 35 : 12
  4. 12 : 35
vijay Professor Asked on 6th August 2015 in Maths.
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1 Answer(s)

Answer: (4) 12 : 35
Explanation:-
a : b = 3 : 5   & b : c = 4 : 7
Formula-
A : B = a : b  & B : C = b : c
Then,  A : C = a  x b/ b x c
A : C = a b / b c

a x b/b x c = 3 x 4 /5 x 7
a / c = 12 / 35
Then, a : c = 12 : 35

Hence, the answer is (4) 12 : 35.

Anurag Mishra Professor Answered on 6th August 2015.
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