Mensa IQ Deductive Reasoning Puzzles Questions and Answers Flashcards

All glurps are snorfs. No snorfs are blimps. Therefore, which conclusion must be true?

Answer: No glurps are blimps

Since all glurps are snorfs and no snorfs are blimps, it follows that no glurps can be blimps.

Four friends — Ana, Ben, Cal, and Dee — each own a different pet: cat, dog, fish, or bird. Ana doesn't own a dog or fish. Ben owns the bird. Cal doesn't own a cat. Who owns the fish?

Answer: Cal

Ben has the bird; Ana can only have a cat; Cal can't have a cat so Cal has the fish; Dee gets the dog.

If the statement 'All poets are dreamers' is true, which of the following must also be true?

Answer: If someone is not a dreamer, they are not a poet

The contrapositive of 'All poets are dreamers' is 'If not a dreamer, then not a poet,' which is logically equivalent.

A sequence follows a rule: 2, 6, 18, 54, ___. What is the missing number?

Answer: 162

Each term is multiplied by 3: 2×3=6, 6×3=18, 18×3=54, 54×3=162.

Tom is taller than Sue. Sue is taller than Ray. Ray is taller than Kim. Which statement is definitely true?

Answer: Ray is shorter than Tom

Tom > Sue > Ray, so Ray must be shorter than Tom by the transitive property.

In a code, FISH = 6-9-19-8. What does DOG equal?

Answer: 4-15-7

Each letter is encoded as its position in the alphabet: D=4, O=15, G=7.

Every time it rains, the ground gets wet. The ground is not wet. What can we conclude?

Answer: It did not rain

By modus tollens: if rain → wet ground, and ground is not wet, then it did not rain.