If a : b : c = 7 : 3 : 5, then (a + b + c) : (2a + b - c) is equal to-

Question: If a : b : c = 7 : 3 : 5, then (a + b + c) : (2a + b - c) is equal to-

Solution:
Given,
a : b : c = 7 : 3 : 5

Let,
(a/7) = (b/3) = (c/5) = k
a = 7k, b = 3k, c = 5k

Now, (a + b + c) : (2a + b - c)
= (7k + 3k + 5k) : {(2 × 7k) + 3k - 5k)
= 15 k : 12 k
= 5 : 4