Question

A bag contains 15 red balls and some white balls. If the probability of drawing a white ball from the bag is 1/6 , find the number of white balls in the bag.

Answer 1

Solution:



Let the Number of white balls in a bag= x


Number of red balls in a bag= 15


Total number of balls in a bag= 15+x


Probability of drawing a white ball from the bag=1/6 ( given)



Probability (white) = number of white balls in a bag /total number of balls in a bag


1/6 = x/ (15+x)



6x = 15+x


6x - x = 15


5x= 15


x= 15/5= 3


x= 3


Hence, the number of white balls in the bag is 3

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Hope this will help you....

Answer 2

ans= 3 white balls
fav.outcomes be x
and total outcomes be 15+x
therefore, x/(15+x)= 1/6