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Is Hector taller than Charley?

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Source: — Data Sufficiency |

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Is Hector taller than Charley?

by Brent@GMATPrepNow » Mon Aug 06, 2018 4:16 pm

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BTGmoderatorLU wrote:Source: Manhattan GMAT

Is Hector taller than Charley?

(1) Hector is 5 feet 7 inches tall.
(2) When Hector stands on a 3-inch thick book, he is one inch taller than Charley.

Target question: Is Hector taller than Charley?

Statement 1: Hector is 5 feet 7 inches tall.
No information about Charley.
Charley COULD be 8 feet tall (i.e., taller than Hector) or Charley COULD be 3 feet tall (i.e., shorter than Hector)
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: When Hector stands on a 3-inch thick book, he is one inch taller than Charley.
This tells us that, when NOT standing on a book, Hector is 2 inched taller than Charley.
So, the answer to the target question is YES, Hector IS taller than Charley
Since we can answer the target question with certainty, statement 2 is SUFFICIENT

Answer: B

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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