Question

a bag contains 5 red balls and some Blue Balls if the probability of drawing a blue ball from the bag is thrice that of the red ball find the number of blue ball in a bag​

Answer 1

Answer:

Step-by-step explanation: let blue balls be x

Probabilityof blue ball x/x+5

Probability of red ball 5/x+5

*ATQ*

x/x+5=3× 5/x+5

X=15

Answer 2

Answer:

Let the no. of blue balls be 'x'

No. of red balls= 5

Total no. of balls= x+5

P(drawing blue ball) = x/ x+5

P(drawing red ball)= 5/x+5

P( drawing blue ball) = 3* P( drawing red ball)

x/x+5 = 3 * 5/x+5

x/ (x+5)3 = 5/ x+5

x/ 3x + 15 = 5/ x+5

x( x+5) = 5( 3x+ 15)

x( x+5) -15 ( x + 5) = 0

x= -5

x= 15

no. of balls cannot be negative

therefore, no. of blue balls = 15

Step-by-step explanation: