Here is a classic:
If 5 rabbits can eat 5 carrots in 5 minutes, how many carrots are eaten by half as many rabbits in half the time?
This kind of problem goes back to at least the middle ages. They have been formulated in many ways: slaves doing work, painters painting walls, cats catching mice, you name it.
You can check your solution here
justpuzzles 
There’s a grammar problem to this question. “how many carrots eat half as many rabbits in half the time” implies the carrots are eating the rabbits.
Thank you very much!
I corrected the issue.
Reblogged this on A World of Puzzles and commented:
To answer please comment x
Sorry to see your blog disappeared