SOLUTION: If there are 2 red balls, 4 blue balls, 6 white balls and a certain number of black balls in a container and the odds of selecting a black ball are 1 out of 5, how many black balls

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Question 1189376: If there are 2 red balls, 4 blue balls, 6 white balls and a certain number of black balls in a container and the odds of selecting a black ball are 1 out of 5, how many black balls are there?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
12+b=number of balls
get 1 choice
b/(b+12)=(1/5)
cross-multiply
5b=b+12
4b=12
b=3 black balls
3/15=1/5