Probability PrepSwift - green balls

Hey there!

I have some difficulty with that question. I’ve tried a bunch of things and always get 1/3 for Quantity A. The provided answer is C. Could someone take a look at it?

There are twice the number of red balls as the number of green balls in a non-empty bag. Let the number of red balls be x.
Quantity A → The probability of getting a green ball
Quantity B → 2/3

That was a typo, which has been fixed.

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