Five people - Adam, Bob, Craig, Daniel and Evan - are of different ages. Daniel is younger than both Adam and Craig. Craig is younger than Bob but older than Evan.

Who among the five is the oldest?

D< A, C

E<C< B(1) The average age of Adam and Bob is less than the average age of Craig and Evan.

A+B <C+E

A+ (B-C) <E

where (B-C) some positive number

This means that E is older A.

D <A<E<C<B

B is the oldest.

Sufficient(2) The average age of Bob and Craig is less than the average age of Adam and Evan.

B+C<A+E

B< A + (E-C)

Because (E-C) is some Negative Number, we can say that A>B

D <E<C<B<A

A is the oldest.

SufficientConcept is good but not in a proper GMAT type format.

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