BRAIN TEASERS
Math (page 122)

Math (page 122)

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 1211 to 1220.
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Find number abc

If 75ccb + cbaca = a0a347 find number abc. Multiple solutions may exist.
Correct answers: 12
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Calculate the number 1179

NUMBERMANIA: Calculate the number 1179 using numbers [6, 4, 9, 9, 33, 231] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 3
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MAGIC SQUARE: Calculate A-B*C

The aim is to place the some numbers from the list (10, 11, 12, 15, 16, 17, 32, 33, 34, 46, 62) 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: 6
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I never wear...

I never wear a Halloween costume... I'm a character all year long!
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Find number abc

If ca3a9 - c3b41 = 1a1b find number abc. Multiple solutions may exist.
Correct answers: 21
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Calculate the number 496

NUMBERMANIA: Calculate the number 496 using numbers [1, 5, 9, 2, 37, 453] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 5
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Find number abc

If 92067 - ccb66 = b8b0a find number abc. Multiple solutions may exist.
Correct answers: 15
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#brainteasers #math
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Calculate the number 1785

NUMBERMANIA: Calculate the number 1785 using numbers [5, 6, 5, 9, 43, 342] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 3
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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 (14, 16, 22, 32, 34, 40, 43, 45, 51, 89) 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: 6
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#brainteasers #math #magicsquare
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Find number abc

If 9baa1 - a3acc = 2502a find number abc. Multiple solutions may exist.
Correct answers: 13
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#brainteasers #math
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Calculate the number 4248

NUMBERMANIA: Calculate the number 4248 using numbers [2, 8, 2, 5, 32, 501] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 4
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#brainteasers #math #numbermania
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Edison phonograph

In 1877, Thomas Alva Edison, though this date is often given as the date of a finished model of his first phonograph, may have actually only made a sketch. Some correspondence in Sep 1877 suggests Edison was at work on his ideas for what became his cylinder phonograph, though construction of a working model may not have begun until 4 Dec, according to the diary of one of Edison's aides. Indeed, Edison did not file for the patent until 24 Dec 1877. The idea came to him while working on a telegraph transmitter, when he noticed that when the tape of the machine was played at high speed, it gave off a noise resembling spoken words. After experimenting with a needle attached to the diaphragm of a telephone receiver to prick paper tape to record a message, his idea evolved to using a stylus on a tinfoil cylinder.«[Image: Sketch dated 20 Nov 1877 given to machinist John Kruesi to make the world's first cylinder phonograph.]
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