there are 70 balls in a box of which 'x' are green and rest are violet.20 more balls are added of which 12 are green and rest not violet.if a ball is picked up randomly from the box then the probability of green ball is same as the probability of violet balls.find no of violent balls and no of balls not violet
Answers
Answer:
need ballsStep-by-step explanation:White
6
Red
9
Green
Total number of balls =5+6+9
=20
(i) Probability =
Total cases
favourable cases
P(Green) =
20
9
(ii) P(White or red) =
20
5+6
=
20
11
(iii) P(neither green nor white) = P(Red)
=
20
6
=
10
3
Answer: There are 41 violet balls and 49 balls not violet
Explanation:
If the probability of picking up green and violet are the same then they must be in the same amount in the box after the addition of balls
Number of violet balls = 70 - x
Number of green balls = x + 12
70 - x = x + 12
⇒ 2x = 70 - 12 = 58
⇒ x = 58/2 = 29
Violet balls = 70 - 29 = 41
Not violet balls = 90 - 41 = 49
(Note that after 20 balls were added the total number of balls became 70 + 20 = 90)