Hi ash4gmat,

Although the original author of this question did not put in the restriction that the ages are all INTEGERS, it appears that that is the "intent" of the question. The questions on the Official GMAT are always carefully worded though (to remove this type of ambiguity).

The statement that each of the pets is 'older than 1' means that each animal is at least 2 years old. Using prime factorization, we're meant to deduce that the ages of the pets are 7, 11 and 13 (in some order). We're asked for Daisy's age.

Fact 1: Daisy is not yet 10.

This means that she's YOUNGER than 10 and there's only one value that fits: 7
Fact 1 is SUFFICIENT

Fact 2: The sum of the digits in Barnum's age is EVEN.

This means that Barnum is either 11 or 13. In either situation, Daisy could be EITHER of the other two ages.
Fact 2 is INSUFFICIENT

Final Answer: A

GMAT assassins aren't born, they're made,
Rich