Question

A bag contains 12 balls out of which some are white and the others are red. If the probability of drawing a white ball at random from the bag is 2/3 then find how many red balls are there in the bag.

Answer 1

4/12..

.

..

. that is equal to 1/3

Answer 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

Explanation:

$Hope \: it \: helps!!$