A bag has 6 blue marbles and 6 red marbles.

Question

A bag has 6 blue marbles and 6 red marbles. Half of the red marbles are made of plastic. A marble is selected at random from the bag. What is the probability that it is a red, plastic marble?

Answer 1

There are 12 marbles total and 3 of them are both red and plastic..

 

3/12 = 1/4