PT57, S3, Q23 In modern "brushless: car washes, cloth strips

by **giladedelman** Wed Jul 07, 2010 5:29 pm

23. (C)
Question Type: Inference
If the fact that modern "brushless" car washes are easier on most cars’ finishes is important for cars with new clear-coat finishes, then it’s probably true that these modern car washes don’t usually scratch cars with older finishes, which we’re told are less easily scratched than the new ones. Is this an airtight inference? No, but it’s the "most strongly supported" of the ones we’re given. This question is a prime example of the importance of eliminating wrong answer choices to succeed in Logical Reasoning.

(A) goes too far; it’s an inference that is impossible to draw without more information, e.g., the total number of cars on the road during the two periods mentioned, the rate at which old and new finishes are scratched by brushes and mitters, etc.
(B) is out of scope. We can’t conclude anything about the immediate cause of the introduction of brushless car washes.
(D) is out of scope. There is no evidence concerning the relative effectiveness of brushes and mitters.
(E) is out of scope. We have no idea as to the proportion of cars with older or newer finishes.