Math
posted by Sarah on .
A bag of marbles contains 5 red, 12 blue and 5 yellow. What is the ratio of red marbles to non red marbles?

5/17

Non red marbles are 12 + 5 = 17.
So the ratio is 5/17. 
A Bag contains 3 blue marbles, 2 red marbles, and 4 green marbles. Mark reaches in and randomly selects a marble. He replaces it, and randomly selects another. What is the probability that both marbles were the same color? What is the probability that 1 was red and the other was green?