Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-152
Section: Logical Reasoning
Topic: Flaw in the Reasoning
Difficulty level: Easy

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Millwright: Most of the wind-pumps we overhauled last year had worn brasses, and most of the pumps that came in with worn brasses were pumps we had been greasing once a year rather than twice, the half-yearly round having been kept for the pumps out on the exposed dykes. So most of the pumps we overhauled last year were pumps on the once-a-year round.

Which one of the following most accurately describes a flaw in the millwright's reasoning?

AIt offers nothing for the claim that the half-yearly round was kept for the pumps out on the exposed dykes

BIt joins two claims about some of a group to reach a claim about most of another, when two overlapping parts of a group settle nothing about the size of the overlap

CIt takes the pumps brought in for overhaul to stand for those in the millwright's charge, when a pump that never comes in is never counted

DFrom most of one group's falling into a second and most of that second's falling into a third, it has most of the first falling into the third, which two majorities do not deliver

EIt gives no figure for the pumps overhauled last year, so each majority it works with is a majority of a total left unstated

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