Question

A bag has 11 green marbles and 4 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? Write your answer as a fraction in simplest form.

Answer 1

Total Marbles: 11 + 4 = 15

Green Marbles = 11

Red marbles = 4

Plastic red marbles = half of red marbles = 1/2 * 4 = 2

We want the probability of a red plastic marble. Which means:

Red Plastic Marbles = 2

Total Marbles = 15

The probability is:

`(2)/(15)`