Allens and Smiths

 Both Allen and Smith have two young sons under eleven. 

The ages of the boys are rounded off to the nearest year.

No two boys are of the same age.

The boys are Arthur, Bent, Carl and David.

Taking the ages of the boys rounded off to the nearest year, the following statements are true.

* Arthur is three years younger than his brother.

* Bent is the oldest.

* Carl is half as old as one of  Allen’s son.

* David is five years older than the younger son of Smith.

* The total ages of the boys in each family differ by the same number today as it was five years ago.

How old is each boy and what are  the family names of each boy?



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