If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) is equal to ______?

14 : 3

2 : 1

7 : 2

None of these

Given a : b : c = 3 : 4 : 7.

Let's find (a + b + c) : c or any other single term. Here we find (a + b + c) : a

a + b + c = 3 + 4 + 7 = 14

(a + b + c) : a = 14 : 3