LSAT 156 | Section 2 | Logical Reasoning: Q17

LR Question 17 Explanation

QUESTION TEXT: To measure a small boat hull accurately, it is necessary to …

QUESTION TYPE: Must Be True

FACTS:

1. To measure a small boat hull, you have to level it before establishing a baseline, using a line level.
2. The scientists aren’t sure whether they leveled it before establishing the baseline.

ANALYSIS: An accurate measurement requires using a line level to level it. We don’t know if the scientists did any of those things, so we can’t really infer much.

The only guaranteed inference is about what’s required for accurate measurement.

___________

1. We don’t know whether they actually measured inaccurately. They’re not sure.
2. Leveling the hull is a requirement for accurate measurement. But, even if you fulfill a requirement for measuring, you can always fail to measure accurately if you try to fail. There is no realistic sufficient condition that would guarantee accurate measurement.
3. A line level is necessary for accurate measurement, but this is treating it as sufficient.
4. CORRECT. If they measured accurately, they must have used a line level.
5. Experience is mentioned, but not tied to accuracy as a requirement.