Q. A bag contains some red balls and some green balls. A ball is drawn at random from the bag. The probability of drawing a red ball is 0.55.
(a) What is the probability of drawing a green ball?
(b) If there are 18 green balls in the bag, find the number of red balls in the bag.
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Answered by
1
the answer is a) 11/200
b) 9/50
Answered by
5
Answer:
Step-by-step explanation:
bag contains =18 balls
no. of red balls =x
Probability of red ball =
total no of ball
Favourable ball
(i) P[red ball]=
18
x
(ii) If two more red ball add
no. of red ball =x+2
total no. of balls =18+2=20
Probability of druuing red ball =
8
9
Probability of red ball coming in part (i)
∴
20
x+2
=
8
9
×
18
x
∴
20
x+2
=
16
x
∴ 16(x+2)=20 x
∴ 16 x+32=20 x
∴ 20 x−16 x=32
∴ 4 x=32
∴ x=8
→ the value of x=8
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