Question

there are 8 red balls, 12 blue balls and x yellow balls. find the number of yellow balls of probability of getting yellow is 1/5​

Answer 1

Answer:

The number of yellow balls is 5

Step-by-step explanation:

Number of red balls = 8

Number of blue balls = 12

Number of yellow balls = x

Total number of balls = 8 + 12 + x

                                    = 20 + x

Given that probability of getting a yellow ball = 1/5

We know that probability =​ $\frac{Favourable outcomes}{Total number of outcomes}$

=> $\frac{1}{5}$ = $\frac{x}{20+x}$

On solving, we get,

1 ( 20 + x ) = 5x

=> 20 + x = 5x

=> 20 = 5x - x

=> 20 = 4x

=> 5 = x

Therefore, the number of yellow balls is 5

Answer 2

Answer:

the number of yellow balls is 5

Step-by-step explanation:

Number of red balls = 8

Number of blue balls = 12

Number of yellow balls = x

Total number of balls = 8 + 12 + x

                                   = 20 + x

Given that probability of getting a yellow ball = 1/5

We know that probability =​

=>  =

On solving, we get,

1 ( 20 + x ) = 5x

=> 20 + x = 5x

=> 20 = 5x - x

=> 20 = 4x

=> 5 = x

Therefore, the number of yellow balls is 5