Hi All,
Most Test Takers would approach this question using a "system" of equations, which is fine. As long as you handle the "time shift" correctly, then you'll get to the correct answer. This question can also be solved by TESTing VALUES - you just have to note that Ann was 4 years old seven years ago....
We're told that 7 years ago, Bob was K times as old as Ann. Then we're told that Ann is NOW 11 years old. Thus, seven years ago, Ann was 11-7 = 4 years old....
Seven Years Ago:
Ann = 4 years old
Let's say that K = 2
Bob = 2(4) = 8 old
Present Day:
Ann = 11 years old
Bob = 8+7 = 15 years old
The question asks for Bob's age NOW, relative to K...
Answer A: 7 + 4(2) = 15 This IS a match
Answer B: 11/2 + 7 = 12.5 NOT a match
Answer C: 11 - 7/2 = Less than 15
Answer D: 11 - 2/7 = Less than 15
Answer E: 8 - 7 = Less than 15
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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