A bag contains 5 red balls and $n$ green balls. If the probability of drawing a green ball is three

Question

A bag contains 5 red balls and $n$ green balls. If the probability of drawing a green ball is three times that of a red ball, then the value of $n$ is\

Professor PC Thomas Classes · Answer

(b) : Probability of drawing a green ball\ $=3 	imes$ Probability of drawing a red ball\ $\Rightarrow \frac{n}{n+5}=\frac{3 	imes 5}{n+5} \Rightarrow \frac{n}{n+5}=\frac{15}{n+5}$\ $	herefore \quad n=15$