Question

Hey friends plz help me....​

Answer 1

Answer:

REFER TO THE ATTACHMENT✌

❤..

Answer 2

Step-by-step explanation:

case 1 number of black ball is x

probability=x/12

case 2 number of black ball =x+6

probability=x/18

2(x/12)=x+6/18

x/6=x+6/18

18x=6(x+6)

18x=6x+36

18x-6x=36

12x=36

3=x