BRAIN TEASERS
Math

Math

These are fun math riddles. All of these tricky riddles are based on real math concepts and can be solved with purely math and logic. These are the tasks listed 1 to 10.
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Calculate the number 2487

NUMBERMANIA: Calculate the number 2487 using numbers [9, 6, 2, 4, 74, 153] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 30
The first user who solved this task is Darrin Haywood.
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MAGIC SQUARE: Calculate A*B+C

The aim is to place the some numbers from the list (16, 17, 23, 29, 31, 32, 38, 40, 41, 46, 47, 94) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A*B+C.
Correct answers: 8
The first user who solved this task is Sanja Šabović.
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#brainteasers #math #magicsquare

When I watch the news I get pa...

When I watch the news I get paranoid. I CNNemy.
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 44
The first user who solved this task is Sanja Šabović.
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#brainteasers #math #riddles
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Find number abc

If 2a7bb + a97ca = 8a4ca find number abc. Multiple solutions may exist.
Correct answers: 29
The first user who solved this task is Snezana Milanovic.
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#brainteasers #math
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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 34
The first user who solved this task is Allen Wager.
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#brainteasers #math #riddles
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Calculate the number 566

NUMBERMANIA: Calculate the number 566 using numbers [5, 8, 3, 9, 11, 539] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Eugenio G. F. de Kereki.
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#brainteasers #math #numbermania
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Find number abc

If 3cbaa + a397a = 49c82 find number abc. Multiple solutions may exist.
Correct answers: 22
The first user who solved this task is Eugenio G. F. de Kereki.
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Calculate the number 297

NUMBERMANIA: Calculate the number 297 using numbers [3, 9, 7, 9, 15, 263] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 15
The first user who solved this task is Eric Mosqueda.
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#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A*B*C

The aim is to place the some numbers from the list (18, 20, 25, 26, 27, 28, 30, 33, 36) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A*B*C.
Correct answers: 8
The first user who solved this task is Maryam Pouya.
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#brainteasers #math #magicsquare
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Radioactivity

In 1896, Henri Becquerel read a report to the French Academy of Sciences of his investigation of the phosphorescent rays of some “double sulfate of uranium and potassium” crystals. He reported that he placed the crystals on the outside of a photographic plate wrapped in sheets of very thick black paper and exposed the whole to the sun for several hours. When he developed the photographic plate, he saw a black silhouette of the substance exposed on the negative. When he placed a coin or metal screen between the uranium crystals and the wrapped plate, he saw images of those objects on the negative. He did not yet know yet that the sun is not necessary to initiate the rays, nor did he yet realise that he had accidentally discovered radioactivity. He would learn more from a further accidental discovery on 26 Feb 1896.
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