Question

An urn 6 blue and x green balls. If the probability of drawing a green ball is double that of drawing a blue ball, then x = ______.

Answer 1

An urn 6 blue and x green balls. If the probability of drawing a green ball is double that of drawing a blue ball, then x = 12.

Explanation:

Equate the probabilities: \[\frac{x}{6+x}=2\times\frac{6}{6+x}\]

Hence, x = 12.