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 7406

NUMBERMANIA: Calculate the number 7406 using numbers [2, 8, 4, 4, 82, 845] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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MAGIC SQUARE: Calculate A+B*C

The aim is to place the some numbers from the list (12, 13, 14, 18, 19, 22, 27, 57, 58, 66) 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: 0
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Find number abc

If abbc4 - abc70 = 2b4 find number abc. Multiple solutions may exist.
Correct answers: 0
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Burglary Witness

An old man was a witness in a burglary case.

The defense lawyer asked Sam, "Did you see my client commit this burglary?"

"Yes," said Sam, "I saw him plainly take the goods."

The lawyer asks Sam again, "Sam, this happened at night. Are you sure you saw my client commit this crime?"

"Yes, says Sam. "I saw him do it."

Then the lawyer asks Sam, "Sam, listen, you are an 80-year-old, and your eyesight is probably bad. Just how far can you see at night?"

Sam says, "I can see the moon. How far is that?"

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Calculate the number 618

NUMBERMANIA: Calculate the number 618 using numbers [1, 9, 2, 3, 11, 621] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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Find number abc

If bc7bc - 17740 = 4a01c find number abc. Multiple solutions may exist.
Correct answers: 0
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Calculate the number 6367

NUMBERMANIA: Calculate the number 6367 using numbers [9, 1, 1, 3, 87, 631] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (13, 15, 16, 18, 20, 23, 37, 39, 44, 61) 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: 0
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Find number abc

If 2baa4 + c992c = 10ba11 find number abc. Multiple solutions may exist.
Correct answers: 0
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Calculate the number 9167

NUMBERMANIA: Calculate the number 9167 using numbers [4, 3, 9, 7, 37, 881] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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Find number abc

If c4bab + 4b5ca = a2aa8c find number abc. Multiple solutions may exist.
Correct answers: 0
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Astatine

In 1931, Fredrick Allison, working in Alabama, reported (erroneously) the discovery of “alabamine,” element 85, now known as astatine, the heaviest halogen. Astatine was first synthesized and correctly identified in 1940 by bombarding bismuth with alpha particles (Corson, MacKenzie, and Segré). All astatine isotopes are highly radioactive and very short lived. Thus the amount of astatine in nature is too small for Allison to have detected, using his own "Magneto-Optic Method of Chemical Analysis," (also debunked.) In the 1920's and 30's, scientists were eager to find the elements 85 and 87, as predicted by Mendeleev. Allison's reported discovery was premature because of poor experimental design and experimenter bias.
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