30 balls, 3 colours, 1 solution
Apr 30, 2018Let's see if you can solve the problem for this week!
You have a black cloth bag that is impossible to see into. Inside, there are 30 balls. The balls are either white, red, or green in colour, but you have no idea how many balls there are of each colour. The only thing you know is that if you reach in the bag and pull out 25 balls at random, you will always have at least 7 white balls, at least 3 red balls, and at least 5 green balls.
How many balls of each colour are actually in the bag?
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