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

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)   (Show Source): You can put this solution on YOUR website!
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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
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            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  blue ball is 1/3,  how many  blue balls are there in the bag ?

For such formulated problem, the solution is as follows.

 =   =====>


3x = 30 + 20 + x


2x = 50


x = 50/2 = 25   blue balls.      ANSWER

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