Answer:
Total number of people in the line for the dunking machine is 8.
Step-by-step explanation:
Here, let us assume the number of people in the line for hoop shoot = 12
So, the number of people in the line for cakewalk
= One- Third of the number of people in line for Hoop Shoot
= 
Also, the number of people in the line for dunking machine
= 2 x ( The number of people in line for Cakewalk)
= 2 x 4 = 8
Hence, the total number of people in line for the dunking machine is 8.