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)