KöMaL 2018 K576
A box contains some red and blue balls. If a ball is picked at random, the probability of its being blue is . If one blue ball is removed from the box, the probability of a randomly selected ball being red will be . How many balls are there in the box?
Official text KöMaL. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
Similar problems
These problems have the most words in common with this statement.