The Official Guide For GMAT® Quantitative Review, 2ND Edition
How many newspapers were sold at a certain newsstand today?
(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today.
(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today.
Statement 1) 100 = 2todays -10 => Todays we can determine. Sufficient.
Statement 2) We need to have the value of newspaper sold yesterday to determine today's. Not Sufficient.
Hence Option A)
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