Puzzles - Puzzle Prime

Split the Cube

Section: Brain Teasers Category: Mathematics

Difficulty: Hard

Can a cube be split into smaller cubes, all with different sizes?

SOLUTION

Solution coming soon.

Unknown Author March 25, 2024

2 Comments

Panther Eyes

Section: Casual Puzzles Category: Maze

Difficulty: Medium

Find your way from one of the panther’s eyes to the other.

SOLUTION

The solution is shown below.

GhoulMagnets March 22, 2024

0 Comments

Airplane on a Conveyor Belt

Section: Brain Teasers Category: Science

Difficulty: Advanced

A Boeing 747 is sitting on a conveyor belt, as wide and long as a runway. The conveyor belt is designed to exactly match the speed of the wheels, moving in the opposite direction. Will the plane take off?

SOLUTION

Solution coming soon.

Unknown Author March 19, 2024

2 Comments

Had Had Had Had Had

Section: Brain Teasers Category: Deduction

Difficulty: Advanced Tags: Words

A teacher in English had asked James and John to describe a man who had suffered from a cold in the past. James while John had had had had had had had had had had had a better effect on the teacher.

Add punctuation to the sentence in bold, so that it makes sense.

SOLUTION

A teacher in English had asked James and John to describe a man who had suffered from a cold in the past. James, while John had had “had”, had had “had had”; “had had” had had a better effect on the teacher.

The meaning is that John had used the phrase “had a cold”, whereas James had used the phrase “had had a cold”. The latter, being more grammatical, had resulted in a better impression on the teacher.

Unknown Author March 16, 2024

0 Comments

Fold Into a Cube

Section: Brain Teasers Category: Practical

Difficulty: Advanced

Cut out the black shape and then fold it perfectly into a cube, without overlapping.

SOLUTION

If the size of each of the small edges of the shape is equal to 1cm, then its area is equal to 30cm². Thus, the cube that is formed by the shape must have an edge of length √5cm. If we set the center of the black shape to be the center of one of the cube’s faces, then the four closest vertices must lie on the boundary of the shape, √2.5cm away. This determines uniquely the folding of the shape which is shown on the simulation below.

Source:

Puzzling Stackexchange

plasticinsect March 13, 2024

0 Comments

Average Salary

Section: Brain Teasers Category: Insight

Difficulty: Advanced

Three friends, A, B and C, want to find out what their average salary is without disclosing their own salaries to the others. How can they do it using only verbal communication?

SOLUTION

A tells B some number, then B adds his salary to it and tells the result to C, then C adds his salary and tells the result to A. Now A subtracts the number he told B in the beginning, adds his own salary and divides by 3. Repeat the same procedure with B and C starting first.

Unknown Author March 10, 2024

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Help Mrs Vampire

Section: Casual Puzzles Category: Maze

Difficulty: Medium

Help Mrs. Vampire get to her sweet home safely, avoiding all the light coming from outside. Of course, she can close the doors if she gets close enough to them.

SOLUTION

The solution is shown below.

Johann Sturcz March 7, 2024

0 Comments

Eminent King

Section: Casual Puzzles Category: Riddle

Difficulty: Medium

Five hundred begins it,
five hundred ends it,
five in the middle is seen.

The first of all letters,
the first of all numbers
take up their stations between.

Put them all together
and bring before you
the name of an eminent king.

SOLUTION

The answer is DAVID. In Roman numerals D=500, V=5, I=1.

Unknown Author March 4, 2024

0 Comments

Six Glasses

Section: Brain Teasers Category: Insight

Difficulty: Medium

Six identical glasses are placed in a row on the table – first three filled with water, and then three empty ones. Can you move just one glass, so that empty and full glasses alternate?

SOLUTION

Take the second full glass, pour all the water into the second empty glass, and then put it back in its place.

Unknown Author March 1, 2024

2 Comments