A box contains ( 12 + x ) (12 + x) ( 12 + x ) red balls and ( 18 + x ) (18 + x) ( 18 + x ) green balls. A ball is drawn at random and is found to be r...
Question
A box contains
red balls and
green balls. A ball is drawn at random and is found to be red. If the probability of the drawn ball being red is
, find the value of
.