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
(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.
B is the oldest.
(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
A is the oldest.
Concept is good but not in a proper GMAT type format.
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