LSAT 77, Logical Reasoning I, Q23, LSATHacks

LR Question 23 Explanation, by LSATHacks

QUESTION TEXT: Most of the mines that Moradco operates in the…

QUESTION TYPE: Must be True

FACTS:

1. Moradco Veleyna mine (most) ➞ violate
2. Moradco gold mine ➞ violate
3. Contrapositive: violate ➞ Moradco gold mine

Combined statement:
Moradco Velyena mine (most)➞ violate ➞ Moradco gold mine

ANALYSIS: This question tests your understanding of how to combine “most” statements with “all” statements. You can only combine “most” statement with sufficient conditions. This is my process:

1. Read everything before drawing.
2. Draw the conditional first.
3. Check whether the sufficient matches with the “most” statement. If it doesn’t, take the contrapositive.
4. Draw the “most” statement combined with the conditional.
5. You can now combine the left part of the “most” statement with the necessary condition.

That sounds very technical. It’s because I’m showing you literally everything I do on this type of question. It’s a mechanical process. Once you internalize those steps, it takes only 10-15 seconds to do steps 2-5.

Here, we can conclude: “Most of Moradco’s mines in Velyena are not gold mines.”

___________

1. The stimulus doesn’t mention other companies.
2. The stimulus never says how many gold mines Moradco operates, or how many mines it has in Velyena.
3. Same as B. The stimulus never mentions numbers. So there are many possibilities.
4. CORRECT. See the analysis above. Since every gold mine commits violations, and most of the Velyena mines don’t, then most of the Velyena mines are not gold mines.
5. Who knows? Worldwide, the question never says how many of Moradco’s mines are gold mines.