Question

A bag contains 7 blue marbles and 9 red marbles. A marble is removed at random and replaced by three of the other color. what is the probability that the marble removed is blue? Answer your question in a simplified fraction.

Answer 1

Answer: 7/16

Explanation:

Given that:

Number of Blue marbles = 7

Number of red marbles = 9

Probability that marble removed is blue :

Probability = ( number required outcome / Total possible outcomes)

Total possible outcomes = total number of marbles = 7 + 9 = 16

Required outcome = number of blue marbles = 7

P(blue marble is removed) = 7 / 16