Question

A bag has 4 red balls and x blue balls. If a ball is drawn from the bag without looking into it and the probability of getting a blue ball is 1/2 , then the value of x is?

Answer 1

yes if a bag has 4 red balls and x blue balls and if the probability of blue ball is 1/2 . so blue balls = 4 and total balls 8 so if he takes one ball out the chances of a blue ball is 1/2

Answer 2

Hi,
No. of red balls in the bag = 4
No. of blue balls in the bag = x
probablity of getting red ball = 1/2 (means half of the total no. of balls)
P (getting a red ball) = 4/x = 1/2 (x= total no. of balls in the bag)
4×2 = 1×x (cross multiplication)
8= x
means total no. of balls in the bag = 8
now no. of blue balls = 8-4
=4 blue balls ANS.

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