Question 3:
A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.
Answer:
Let the number of blue balls be x.
Number of red balls = 5
Total number of balls = x + 5
P (getting a red ball) = 5/(x + 5)
P (getting a blue ball) = x/(x + 5)
Given that,
However, the number of balls cannot be negative.
Hence, number of blue balls = 10
Latest Govt Job & Exam Updates: