puzzles

[Axer NZ]

If three cats catch three mice in three minutes how many cats would be needed to catch 100 mice in 100 minutes?

^ I still have no takers on mine...

Well, obviously, three cats can catch a mouse per minute. Since the second part is on the same par, you would still only need 3 cats.

You have two buckets, one has 5 litres of red wine in it and the other one has 5 litres of white wine in it. (1 litre ~ 1 quart)
You tip 2.5 litres of the bucket of red wine into the bucket of white wine and then mix it well, then you tip 2.5 litres of the bucket of white wine back into the bucket of red wine and mix it well.
How much red wine do you have in each bucket?

Well (assuming the buckets have a capacity of >=7.5 liters and you spill none), after the pouring you would have 2.5 liters of 100% red wine and 7.5 liters of 33.3% red wine. Putting 2.5 liters of the 33.3% into the red wine bucket would have a net of 66.6% in the red bucket and 33.3% in the white bucket.

Since each bucket contains 5 liters, you have 3 1/3 liters of red in the red wine bucket and 1 2/3 liters of red in the white wine bucket.