Question

a bag contains 20 balls out of which x are white (1) if one ball is drawn at random find the probability that it is white be(2) if 10 more white ball are put in the bag the probability of drawing a white ball will be double that in part a​

Answer 1

Answer:

Step-by-step explanation:

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