The fastest way to improve at LSAT Logical Reasoning is not doing more questions — it is doing questions with answers that explain the method. This page works through complete questions and answers using a three-step method that applies to every argument-based type, then shows exactly where each wrong answer was designed to catch you.
Since August 2024, Logical Reasoning has carried most of the LSAT: the current test runs four 35-minute sections — two scored LR sections, one scored Reading Comprehension, and one unscored section — after LSAC removed the logic games section entirely. Two of your three scored sections are Logical Reasoning. There is no way around this question type anymore.
The three-step method
Every argument-based LR question — assumption, strengthen, weaken, flaw — rewards the same first two moves. Only the third step changes with the question type.
Step 1: Find the conclusion, strip the argument
Reduce the stimulus to premise → conclusion in the plainest words you can manage. "Study says exercisers live longer, so exercise extends life." Nothing fancier is needed — the roughness is the point, because it exposes structure.
On harder stimuli, separate the argument from its packaging. A stimulus can carry up to six kinds of content: premises, an intermediate conclusion, the main conclusion — that trio is the argument — plus background information, an opposing viewpoint, and concessions, which are wrapping. The intermediate conclusion deserves special attention: it is a claim that is supported by one premise and then itself supports the main conclusion. Mistaking it for the main conclusion is one of the quietest ways to lose points on otherwise easy questions.
Step 2: Locate the gap
Compare premise and conclusion: what does the conclusion contain that the premises never provided? In the exercise example, the premise offers a correlation and the conclusion asserts a cause — the word "extends" is doing unsupported work. That mismatch is the gap, and nearly every credited answer in the argument family lives there.
Step 3: Apply the type-specific test
- Necessary assumption: use the negation test. Negate the answer choice; if the argument collapses, it was necessary. Keep the distinction sharp: a necessary assumption is the minimum the argument cannot live without, while a sufficient assumption single-handedly guarantees the conclusion. Necessary-assumption answers are modest — the strong, sweeping option is usually the trap.
- Weaken: attack the gap with new information, most often by supplying an alternative explanation. You are not asked to disprove the conclusion — dropping its plausibility is enough.
- Strengthen: plug the gap, most often by ruling out an alternative explanation. You are not asked to prove the conclusion — raising its plausibility is enough.
Worked question 1: necessary assumption
Stimulus: "The city's new express bus line will shorten average commute times downtown, since riders will no longer sit through the seventeen local stops on the old route."
Question: Which one of the following is an assumption on which the argument depends?
(A) The express line will be cheaper to operate than the old local route. (B) Most downtown commuters currently ride the old local route. (C) At least some current commuters will use the express line. (D) The express line will make no stops at all between terminals. (E) No other city has failed to shorten commutes with an express line.
Answer: (C). Run the negation test: if no commuter uses the express line, skipped stops shorten nobody's commute and the argument dies — so (C) is required. (B) fails the same test survivably: even if most commuters don't ride the old route, the average can still drop as long as some switch. (D) is the classic too-strong trap — the argument needs the express route to be faster, not stop-free. (A) is about cost, not time; (E) is irrelevant history. Notice how modest the credited answer is: that is what necessary assumptions look like.
Worked question 2: weaken
Stimulus: "Employees who attended the company's time-management workshop finished their quarterly projects earlier than employees who did not. Clearly the workshop improved attendees' efficiency."
Question: Which one of the following, if true, most seriously weakens the argument?
(A) The workshop was offered twice and both sessions were full. (B) Some attendees say they enjoyed the workshop. (C) Sign-ups were voluntary, and the employees who enrolled already had the strongest on-time records in the company. (D) The workshop's instructor has published two books on productivity. (E) A few attendees finished their projects late.
Answer: (C). The argument reads a correlation as causation. (C) supplies the alternative explanation — self-selection: the efficient people signed up, so the workshop may have caused nothing. This is the single most tested weakener pattern on the LSAT. (E) is the tempting near-miss: a few late finishers barely dents a claim about averages. (A), (B), and (D) decorate the workshop without touching the causal link. Remember the standard: you accept every option as true and ask only how hard it hits the argument.
How to practice with questions and answers
Work untimed first, and spend more time in the answers than in the questions. For every question, do three things: predict the answer before reading the options; after solving, name the trap each wrong option was built from; and say which step of the method the question was really testing. Speed is a byproduct of recognition, and recognition comes from exactly this slow work.
When you want structured sets by question type, our LSAT practice questions hub has ten five-option samples across the five main types, each linking to a full 12-question quiz. For the recurring patterns behind flaw and weaken questions, see the ten reasoning flaws that keep coming back. And when you are ready to sit a timed paper, the 20-minute logical reasoning test scores you by question type.
FAQ
How many logical reasoning questions are on the LSAT?
The current LSAT has two scored 35-minute Logical Reasoning sections (plus one scored Reading Comprehension section and one unscored section). LSAC does not publish an official per-section question count; based on recently released tests, a section runs roughly 24–26 questions — about 80 seconds each.
Are these real LSAT questions and answers?
No — the questions here are original, written in the official five-option format. Official released questions are copyrighted; practicing on originals also means nothing here can spoil a real PrepTest for you.
What is the negation test?
A verification tool for necessary-assumption questions: negate the answer choice, and if the argument falls apart, the choice states a necessary assumption. It works because "necessary" means the argument cannot survive without it.
Did the LSAT really drop logic games?
Yes. LSAC removed the Analytical Reasoning (logic games) section starting with the August 2024 test and replaced it with a second scored Logical Reasoning section — which is why LR now decides most of your score.