+++
 A  
++++
 B  
+++
The ages of Ambrose, Brandon and Chester can be related to the diagram above so that when just one digit is written in each box:
 A across is Ambrose's age in years.
 A down is the sum of Ambrose's and Brandon's age in years.
 B across is the sum of Ambrose's age, Brandon's age and Chester's age
in years.
 Two of Ambrose, Brandon and Chester are the same age in years.
Who is a different age in years from the other two?
(In reply to
all solutions by Ady TZIDON)
If A=B=10, for example, then A+B would be 20 (that is, Ambrose and Brandon). But Ambrose (A across) is supposed to start with the same digit as Ambrose+Brandon (A down).

Posted by Charlie
on 20130201 14:14:39 