Notice that the box has a total os 4 + 5 + 3 = 12 balls, since there are 4 that are yellow, then, the probability to randomly obtaining a yellow ball in a single draw is:

therefore, the probability is 0.33 = 33%
Answer:
C. 3
Step-by-step explanation:
2x+6
Divide 2 on both sides
x=3