A bag contains 15 red marbles, 20 blue marbles, and 25 green marbles. Which of the following statements is true?
The ratio of red marbles to blue marbles is 3:4.
The ratio of blue marbles to green marbles is 4:3.
The ratio of green marbles to the total number of marbles is 1:2.
For every 5 red marbles, there are 3 blue marbles.
