Lucky??
Two pails A and B have a capacity of 11 liters each. Pail A contains 10 liters of pure hydrogen peroxide and Pail B with 10 liters of pure water. I fill B up to the brim of what's in A then fill A up to the brim of what's in B. If I will have to repeat this till I get at least 45% hydrogen peroxide in B, how many times at least will I have to fill B?
The answer is 7.
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