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  1. If a : b : c = 7 : 3 : 5, then (a + b + c) : (2a + b – c) is equal to
    1. 1 : 2
    2. 2 : 3
    3. 3 : 4
    4. 5 : 4
Correct Option: D

a : b : c = 7 : 3 : 5

⇒ 
a
 =
b
=
c
 = k (let)
735

⇒  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


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