Logical Reasoning · Principle

PrepTest 151 · Section 3 · Question 6

Phase 1 (your first ~400 questions): read the guidance, then answer. No clock.

Step 1 · Pre-Question Guidance · read this first

Question type

Principle

The one idea it tests

Pick the rule that makes one speaker's 'this fix beats that fix' come out true.

The basic logic

The second speaker blames something brought in from outside and prefers removing it. The right principle connects 'outside thing causing the harm' to 'removing it is the better fix.' It must favor that speaker's plan over the first one's.

Tiny words that decide it

“better than”
“any other”
“so”

Playground logic

Grandpa wants Mr. Whiskers to chase rabbits to save the lettuce. Aunt Rosa says the real trouble is the vine Grandpa brought in, which shades the baby lettuce, so pull the vine. The principle that backs her: when an outside newcomer causes the harm, removing it beats other fixes.

Step 2 · The kid story

The Lettuce Rescue

Grandpa's lettuce was in trouble. "To save it," he announced, "we let Mr. Whiskers patrol the garden. Each rabbit eats a whole row a week." Mr. Whiskers yawned. Aunt Rosa shook her head. "The true trouble is that climbing vine you brought home from the fair. You planted it for shade on your bench. But it spread over the baby lettuce, and they can't get any sun. They're starving for light." Grandpa scratched his chin. "So?" "So pulling out the vine is better than sending the cat after rabbits." Lulu wrote on her clipboard: Newcomer plant hurts lettuce. Remove newcomer, better than other fixes. "That's the rule that makes Aunt Rosa right," she said.

Step 3 · Try the model question

Grandpa: To protect the lettuce, we must let the cat chase off rabbits. Aunt Rosa: The real trouble is the vine you brought in from elsewhere, which blocks sunlight the young lettuce needs. So pulling out the vine is better than using the cat.

Which rule, if accepted, gives the most support to Aunt Rosa's conclusion?

Step 4 · The courtroom tale

The Case of the Noisy Fountain

A fictional park's ducks were leaving. The parks lawyer told Judge Amara, "Your Honor, we must scare off the geese. They chase the ducks." Mr. Whitfield stood. "The real cause is the new fountain the city installed. Its noise drives the ducklings away from their feeding spot. Turning off the fountain is better than chasing geese." The judge asked, "What rule supports you?" Mr. Whitfield bowed. "When something brought in causes the harm, removing it beats every other fix, Your Honor." The judge nodded. "That rule does favor your plan."

Step 5 · Work the real question

Open PrepTest 151, Section 3, Question 6 in your official copy from LSAC (for example in LawHub) and read it there.

Your answer

How to apply it

Find the speaker whose conclusion you need to support, and write their conclusion in a few words. Note the special feature of their evidence: what they say is the true cause, and where it came from. The right principle links that feature to that conclusion. Check each choice: does it make this speaker's plan better than the other plan? Drop rules about speed, keeping numbers up, future planning, or which members matter most unless they connect those exact dots.