An urn contains g green marbles and b blue marbles

An urn contains g green marbles and b blue marbles. If 3 green marbles and 6 blue marbles are added, and then one marble is selected at random from the urn, what is the probability that a blue marble will be drawn?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #26109