Alberto, Benito and Carlos are three very intelligent brothers. One day the following conversation occurs between them:
- Carlos: - Have you noticed Benito that I am three years older than you?
- Benito: -Yes, I had noticed. But have you taken into account that in two years you will be twice as old as Alberto will be?
- Alberto: -Dear brothers, if someone listens to our conversations, I could easily deduce how old we are! The only data that would be missing is that I have one year more than Benito.
- Carlos: Ha ha, it's true. How smart we are!
What is the age of each of the three brothers?
Benito is 4 years old, Alberto 5 and Carlos 12.