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.
[spoiler]OA=B[/spoiler]
Source: Manhattan GMAT
Is Hector taller than Charley? (1) Hector is 5 feet
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Statement 1 is useless. Statement 2 tells us Charley is 2 inches taller than Hector, so is sufficient.
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