BRAIN TEASERS
Math (page 60)

Math (page 60)

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 591 to 600.
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Find number abc

If 6c6a1 + 6148b = 12a1c1 find number abc. Multiple solutions may exist.
Correct answers: 0
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Calculate the number 3440

NUMBERMANIA: Calculate the number 3440 using numbers [5, 5, 4, 2, 34, 349] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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Find number abc

If 5ac0c + b42b0 = 86abc find number abc. Multiple solutions may exist.
Correct answers: 0
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#brainteasers #math

The psychiatrist was not expec...

The psychiatrist was not expecting the distraught stranger who staggered into his office and slumped into a chair. "You've got to help me. I'm losing my memory, Doctor," he sobbed. "I once had a successful business, a wife, home and family; I was a respected member of the community. But all that's gone now. Since my memory began failing, I've lost the business - I couldn't remember my clients' names. My wife and children have left me, too; and why shouldn't they - some nights I wouldn't get home until four or five in the morning. I'd forget where I lived...And it's getting worse. Doctor - it's getting worse!"

"This is not an unusual form of neurosis," the psychiatrist said soothingly. "Now tell me, just how long ago did you first become aware of this condition?"

"Condition?" The man sat up in his chair. "What condition?"
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Calculate the number 1102

NUMBERMANIA: Calculate the number 1102 using numbers [8, 3, 3, 6, 45, 982] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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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 (9, 11, 12, 15, 17, 18, 48, 50, 51, 97) 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: 1
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#brainteasers #math #magicsquare
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Find number abc

If b88a9 - c690a = cc9a4 find number abc. Multiple solutions may exist.
Correct answers: 2
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#brainteasers #math
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Calculate the number 725

NUMBERMANIA: Calculate the number 725 using numbers [4, 3, 1, 5, 75, 121] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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#brainteasers #math #numbermania
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Find number abc

If aaac7 + 2ab86 = 6880b find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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Calculate the number 983

NUMBERMANIA: Calculate the number 983 using numbers [4, 4, 9, 9, 73, 910] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
CHECK ANSWER
#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A+B-C

The aim is to place the some numbers from the list (13, 17, 18, 20, 22, 24, 26, 28, 30, 62, 64, 70) 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: 1
CHECK ANSWER
#brainteasers #math #magicsquare
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Edison incandescent lamp filament patent

In 1899, Thomas A. Edison was issued a patent for his “Filament for Incandescent Lamps, and Process of Manufacturing Same” (U.S. No. 626,460). “I form a filament of highly-refractory non-conducting material which is preferably porous, and incorporate therein isolated particles of carbon, so as to produce spark gaps between the particles, whereby high-tension currents, either alternating, continuous, or intermittent, will be conducted from particle to particle of the carbon to raise the filament to incandescence. ... I prefer to use ... an oxid or oxids of the rare earths—such as the oxid of zirconium, thorium and others. ... I prefer to admix ... a carbonizable organic compound—such as a solution of sugar, asphalt or tartrate of the oxid itself” which will be carbonized.«
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