Correct answer : 15

Solution:

A + A = 2 ……………(1)
A + B = 3 ………..….(2)
A + B + C = 6 ………(3)

From equation (2) A + B = 3 putting in equation (3)

3 + C = 6
C = 6–3 =3

Now putting the value of (A + B) and C*4

A+B+C*4
3+3*4 = 3+12 = 15
applied BODMAS rule

So final answer is 15

Cheers !!!