Question

a bag contains 15 balls of which x are blue and the remaining are red .if the number of red balls are incrrased by 5 the probability of drawing the red ball gets doubles. find p (red balls),p (blue balls).p (blue balls if 5 extraa red balls are actually added ​

Answer 1

Total balls=15





Blue balls=x





Red balls=15-x




P(blue balls)=x/15





P(red balls)=15-x/15





If 5 red balls are added then total balls = 15+5=20





Blue balls=x+5







Red balls=15-x+5=20-x







P(red balls)=20-x/20






ATQ, x-5/15=2(20-x/20)





10x-50=300-15x






On solving,x=14




P(red balls)=1/15





P(blue balls)=14/15




P(blue balls if 5 red balls are added)=19/20