LSAT 107 | Section 1 | Logical Reasoning: Q3

LR Question 3 Explanation

QUESTION TEXT: There should be a greater use of gasohol. Gasohol is a mixture of…

QUESTION TYPE: Strengthen – Exception

CONCLUSION: There should be a greater use of gasohol.

REASONING: Gasohol has a higher octane rating and fewer carbon monoxide ratings than gasoline. It adds no more CO2 than plants remove by photosynthesis.

ANALYSIS: On a question like this it’s good to think about things you would like in a fuel. We need to eliminate four wrong answers that show gasohol is better. So it’s a good bet there will be advantages listed such as: cheaper, cleaner, plentiful, efficient, etc.

The right answer actually weakens the argument, even though it didn’t have to.

___________

1. This is another advantage for gasohol: it makes cars run better.
2. Now society doesn’t have to worry about energy. Thanks, gasohol!
3. CORRECT. This shows that gasohol is slightly less fuel efficient. This actually weakens the argument (a tiny bit.) 
4. Cheap fuels are better than expensive fuels. Advantage: gasohol.
5. Gasohol does not add more CO2 than plants can remove. So gasoline upsets the CO2 balance but gasohol doesn’t. One more advantage for gasohol.