A bag contains 20 black balls and 10 white balls

A bag contains 20 black balls and 10 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?

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 #2089