The following question is from GMAT PREP EXAM 2. I couldn't find an explanation in relates to this problem. Please assist.

A certain bag contains only red balls, blue balls, and green balls. what percent of all the balls in the bag are red?

1. The ratio of the number of red balls to the number of blue balls in the bag is 1:3
2. There are 2 green balls in the bag.

My analysis:

Since the question asks you to find the % of red balls in the bag, you need total number of balls and the balls that are red.

Statement 1 is not sufficient since it only provides a ratio. moreover, it doesn't provide any information on green balls.

Statement 2 is not sufficient since it doesn't provide any information on blue or red balls.

Combined: I thought this was sufficient since there are only 2 green balls in the bag and that means that the ratio is 1:3:2. which means there is 1 red ball 3 blue ball, and 2 green balls, a total of 6 balls. % red = 1/6 = .167 = 16.7%.

Please tell me where I went wrong with my analysis and provide explanation.

Correct Answer is E