Question

A bag contains 5red balls and some blue balls. if probability of drawing blue ball is double that of a red ball, determine the number of blue balls in a bag???

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Answer 1

Answer:

10

Step-by-step explanation:

Here, the question clearly says that the number of blue balls is twice of the number of red balls. And, the number of red balls is 5 .

So, the number of blue balls = 5 × 2 = 10.

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Answer 2

Answer:

Let number of blue balls in the bag =x

Total no of balls in bag =5+x [No. of redball =5]

Probability of drawing a blue ball =

No. of blue ball

Total no of ball

P(B)= x

5+x

Probability of drawing a Red ball =

No. of red ball

Total no of ball

P(R)= 5

5+x

Given,

P(B)=2P(R)

x

5+x

=2( x )

( 5+x )

x=10

Hence, no. of blue balls in the bag =10.

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