Question

a bag contains 15 balls, out of which some are white and others are black. if the probability of drawing a black ball is 2/3, then find the number of white balls present in the bag.

Answer 1

Answer:

5 balls

Step-by-step explanation:

15 * 2/3 = 10

the no. of black ball in it is 10

no. white balls = 15 - 5 = 5

there are 5 balls

Answer 2

Answer:

The number of white balls = 5 balls

Step-by-step explanation:

Given a bag contains 15 balls, out of which some are white and others are black. if the probability of drawing a black ball is 2/3, then we have to find the number of white balls present in the bag.

Total number of balls present in bag=15

Let the number of black balls are x

∴ the number of white balls are 15-x

$Probability (\text{black balls})=\frac{\text{Favourable outcomes }}{\text{total number of outcomes}}=\frac{x}{15}$

But given probability is $\frac{2}{3}$

⇒ $\frac{x}{15}=\frac{2}{3}$

⇒ $x=10$

∴ The number of white balls are 15-x=15-10=5 balls.