Question

A bag contain 5 red balls and
some bue ball. If the probablity
of drawing a blue ball
is thrice that of red ball find the number of blue balls in a bag


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Answer 1

Answer:

10

Step-by-step explanation:

Let the no. of blue ball be X

No. of red balls = 5

Total no. of balls = No. of blue balls + No. of red balls = X + 5

Probability of getting blue balls = X/(X+5)

Probability of getting red ball = 5/(X +5)

A/q,

X/(X+5) = (2*5)/(X+5)

Cancelling X+5 from both terms as they are common,

X = 10

So, there are 10 blue balls in the bag.

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