From Trick of mind site:
Today is Alice’s birthday. She turned 24. Alice is twice as old as Bob was when Alice was as old as Bob now. How old is bob now ?
See the result on http://trickofmind.com/2009/06/alice-and-bob.html
From Trick of mind site:
Today is Alice’s birthday. She turned 24. Alice is twice as old as Bob was when Alice was as old as Bob now. How old is bob now ?
See the result on http://trickofmind.com/2009/06/alice-and-bob.html