BRAIN TEASERS
Math (page 3)

Math (page 3)

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 21 to 30.
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Calculate the number 3898

NUMBERMANIA: Calculate the number 3898 using numbers [8, 2, 5, 6, 75, 852] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 4
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Find number abc

If 3a131 - c0c6c = 1486b find number abc. Multiple solutions may exist.
Correct answers: 18
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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Calculate the number 6140

NUMBERMANIA: Calculate the number 6140 using numbers [8, 6, 6, 2, 22, 986] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 7
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania

A Yankee lawyer went duck hunt...

A Yankee lawyer went duck hunting in eastern North Carolina. He shot and dropped a bird, but it fell into a farmer's field on the other side of a fence. As the lawyer climbed over the fence, an elderly gentleman asked him what he was doing. The lawyer responded, "I shot a duck and it fell in this field, I'm going into retrieve it." 
The old farmer replied. "This is my property, and you are not coming over here." 
The indignant lawyer said, "I am one of the best trial attorneys in the U.S. and, if you don't let me get that duck, I'll sue you and take everything! 
The old farmer smiled and said, "Apparently, you don't know how we do things here in North Carolina. We settle small disagreements like this with the NC Three-Kick Rule." 
The lawyer asked, "What is the NC three-Kick Rule?" 
The Farmer replied. "Well, first I kick you three times and then you kick me three times, and so on, back and forth, until someone gives up." 
The Yankee attorney quickly thought about the proposed contest and decided that he could easily take the old southerner. He agreed to abide by the local custom. 
The old farmer slowly climbed down from the tractor and walked up to the city feller. His first kick planted the toe of his heavy work boot into the Yankee lawyer's groin and dropped him to his knees. His second kick nearly wiped the man's nose off his face. The barrister was flat on his belly when the farmer's third kick to a kidney nearly caused him to give up. 
The Yankee lawyer summoned every bit of his will and managed to get to his feet and said, "Okay, you old redneck southerner, now it's my turn." 
The old North Carolina farmer smiled and said, "Now, I give up. You can have the duck."
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MAGIC SQUARE: Calculate A-B-C

The aim is to place the some numbers from the list (16, 17, 22, 24, 25, 30, 54, 55, 60, 69, 79, 88) 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: 9
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #magicsquare
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Find number abc

If 8acc7 + 39678 = b2ab2a find number abc. Multiple solutions may exist.
Correct answers: 16
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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Calculate the number 1054

NUMBERMANIA: Calculate the number 1054 using numbers [5, 5, 1, 5, 75, 114] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 5
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Find number abc

If 68b10 - c6a78 = 4c1ac find number abc. Multiple solutions may exist.
Correct answers: 19
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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Calculate the number 905

NUMBERMANIA: Calculate the number 905 using numbers [7, 2, 4, 3, 46, 820] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Nílton Corrêa de Sousa.
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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 (7, 8, 14, 24, 25, 31, 57, 58, 64) 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: 10
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #magicsquare
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Find number abc

If b2b71 - 12b5a = a001c find number abc. Multiple solutions may exist.
Correct answers: 21
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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The aim is to place the some numbers from the list (8, 10, 15, 18, 20, 25, 34, 43, 45, 50, 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.
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Black-American patent

In 1834, Henry Blair of Glenross, Maryland, received a U.S. patent on a corn planter (No. X8447). Two years later, on 31 Aug 1836, he was also issued a patent on a cotton seed planter (No. 15). Blair was born in Maryland about 1807 and lived until 1860. He was a successful farmer whose inventions met a need to increase efficiency in farming. His patents were signed with a simple "X" because he had not learned to read or write. Henry Blair was the second African-American to hold a patent. For some time he had been regarded as the first, until it became better known that the first African-American on record to be granted a patent was Thomas Jennings for a "dry-scouring" cleaning process (3 Mar 1821, No. X3306).«[Image top: side view of machine; bottom: detail of section of seed hopper showing cylinder with holes in the periphery that turns with the wheels to drop grains of corn.]
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