Question

. If a : b = 3:5 and b:c=7:8 then 2a : 3b : 7c is equal to
is equal to:
(a) 42: 105 : 320 (6) 15 : 21:40
(c) 6:15:40 (d) 30: 21 : 350
(CDS Exam, 2015)
10T​

Answer 1

Step-by-step explanation:

You have to make b common.

a:b can also be written as 21:35

b:c can be written as 35:40

Therefore, a:b:c = 21:35:40

So the final answer is a