9. A bag contains 5 red balls and some blue balls. If the probability of drawing a
blue ball is double that of a red ball, find the number of blue balls in the bag.(ver urgent please help me)
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10 blue balls are there
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Answer:
If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag. Let number of blue balls be x. Red balls are 5. ∴ Total blue balls are 10.
Step-by-step explanation:
Let number of blue balls in the bag =x
Total no of balls in bag =5+x [No. of red ball =5]
Probability of drawing a blue ball =
Total no of ball
No. of blue ball
P(B)=
5+x
x
Probability of drawing a Red ball =
Total no of ball
No. of red ball
P(R)=
5+x
5
Given,
P(B)=2P(R)
5+x
x
=2(
5+x
5
)
x=10
Hence, no. of blue balls in the bag =10
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