25. A bag contains 12 balls out of which x are white.
(1) If one ball is drawn at random, what is the
probability that it will be a white ball?
(ii) If 6 more white balls are put in the bag, the
probability of drawing a white ball will be double
than that in (i). Find x.
Answers
Answered by
2
Answer:
1)
no of balls=12
no of white balls =x
p(white ball) = no. of favourable outcomes/no of total possible outcomes
= x/12----(1)
2)
if 6 more white balls are put in the bag
no of total balls = 18
no of white balls =x+6
p(white balls)= (x+6)/18---(2)
therefore
(x+6)/18 = 2*x/12
(x+6)/18 =x/6
x+6 = 18x/6
x+6=3x
6=3x-x
6=2x
2x=6
x=6/2
x=3
Similar questions