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A library trust observes that its town branch issued 14,000 books last year while its village branch issued 3,500, and concludes that readers in the town make better use of their branch than readers in the village make of theirs. What is the trust taking for granted?

Competition practiceLogical / Critical
  • AThat the two branches serve a similar number of readers, so that the larger total is not simply the result of the town branch having many times as many members on its roll
  • BThat both branches remained open throughout the year
  • CThat the two branches hold books on the same subjects
  • DThat a book issued at one branch is returned to the same branch

Step-by-Step Solution

The verdict is about how well each reader uses his branch, but the evidence is a total for the branch. The two coincide only if the two rolls are of similar size; if the town roll is ten times the village roll, the village reader borrows two and a half times as often and the verdict is exactly wrong. Opening days, the subjects stocked and where books are returned do not close that gap.
Answer: A) That the two branches serve a similar number of readers, so that the larger total is not simply the result of the town branch having many times as many members on its roll

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