Question

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Answer 1

Step-by-step explanation:

Total probability is 1 for any event. Here, one probability is double than other, so one part will be 2/3 and other will be 1/3.

Now, probability of getting blue ball is,

blue balls / total balls, suppose, number of blue balls are x.

So, X/(X + 5) = 2/3, on solving this X = 10.

Answer = 10.

Answer 2

Step-by-step explanation:

P(B)=2*P(R)

let total balls be 5+b,

so,[b/5+b ]=2*[5/5+b]

b=10

no.of blue balls are 10