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 !!!

Explanation :

Equation 1:

10+10+10=30   ( here couple having yellow bag in hands)

Equation 2 : 

5+5+5=15

Equation 3:

2 yellow bags+ 1 yellow +1 yellow=24

12+6+6=24

Equation 4:

6+10*4=?

apply BODMAS

6+(40)=46

Correct answer is 46

Hint: one yellow bag (6) + two brown bangs (10)+chines couple without yellow bag in hand(10-6=4)