Question

.A bag contains 6 red balls and some blue balls.If the probability of drawing a red ball is 3/5, the number of blue balls in the bag is
options :
3
4
5
6
​

Answer 1

Answer:

the probability of getting blue balls = 4/10 or 2/5

Answer 2

Your answer is 3.

SOLUTION :

Total no. of balls = 12.

Let total no. of black balls be x .

Therefore, P (getting a black ball )= x/12.

If 6 more black balls are put in the box then

Total no. of black balls =x+6.

Therefore, P (of getting a black ball ) = (x+6)/18

ATQ,

2× ( x /12 )= (x+6)/18.

=> 18x= 6 (x+6)

=> 18 x = 6x+36

=> 12x=36

=> x= 36/12 = 3.