Hi All,
This question can be solved by TESTing VALUES.
We're given three facts about the ages of two people:
1) The positive difference between Sam and Lucy’s ages is a,
2) The sum of their ages is z.
3) Lucy is older than Sam
We're asked which of the following represents Lucy’s age:
IF....
Lucy = 3
Sam = 2
a = 3-2 = 1
z = 3+2 = 5
So we're looking for an answer that equals 3 when a=1 and z=5.
Answer A) (z - a)/2 = (5-1)/2 = 2 NOT a match
Answer B) a - z/2 = 1 - 5/2 = Negative
Answer C) 2a + z = 2+5 = 7 NOT a match
Answer D) (z + a)/2 = (6)/2 = 3 This IS a MATCH
Answer E) (a - z)/2 = (1-5)/2 = Negative
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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