SOLUTION: There are 30 red balls and 20 green balls and some blue balls in a bag. If the probility of finding a red ball is 1/3. How many are red balls in the bag

Algebra ->  Permutations -> SOLUTION: There are 30 red balls and 20 green balls and some blue balls in a bag. If the probility of finding a red ball is 1/3. How many are red balls in the bag       Log On


   

Question 1142897: There are 30 red balls and 20 green balls and some blue balls in a bag. If the probility of finding a red ball is 1/3. How many are red balls in the bag
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
.
There are 30 red balls and 20 green balls and some blue balls in a bag. If the probility of finding a red ball is 1/3.
How many are red balls in the bag
~~~~~~~~~~~~~~~~~~~~~


            The original formulation is  INCORRECT  and nonsensical,  since the number of red balls is just  GIVEN.

            To make sense,  the problem  MUST  BE  RE-FORMULATED.  For example,  in  THIS  WAY : 

             There are 30 red balls and 20 green balls and some blue balls in a bag. 

             If the probability of finding a highlight%28cross%28red%29%29 blue ball is 1/3,  how many highlight%28cross%28red%29%29 blue balls are there in the bag ?

            For such formulated problem,  the solution is as follows. 


x%2F%2830+%2B+20+%2B+x%29 = 1%2F3  =====>


3x = 30 + 20 + x


2x = 50


x = 50/2 = 25   blue balls.      ANSWER