If `a : b = 3 : 5` and `b : c = 7 : 8`, then `2a : 3b : 7 c` is equal to

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Q 1649891713.     If `a : b = 3 : 5` and `b : c = 7 : 8`, then `2a : 3b : 7 c` is equal to
CDS 2015 Paper-2
A

`42:105 :320`

B

`15:21:40`

C

`6:15:40`

D

`30:21:350`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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