Daily Brain Teasers for Friday, 31 October 2025
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puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, stereograms, ... |
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.
#brainteasers #math #numbermania
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.
#brainteasers #math #magicsquare
Find number abc
If 2baa4 + c992c = 10ba11 find number abc. Multiple solutions may exist.
#brainteasers #math
Walking economy
A guy is walking down the street with his friend. He says to his friend, "I'm a walking economy."
His friend replies, "How's that?"
"It's like this -- my hair line is in recession, my stomach is a victim of inflation, and the combination of these factors is putting me into a deep depression."
Find the right combination
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
#brainteasers #mastermind
Galileo FerrarisBorn 31 Oct 1847; died 7 Feb 1897 at age 49.Italian physicist who studied optics, acoustics and several fields of electrotechnics, but his most important discovery was the rotating magnetic field. He produced the field with two electromagnets in perpendicular planes, and each supplied with a current that was 90º out of phase. This could induce a current in a incorporated copper rotor, producing a motor powered by alternating current. He produced his first induction motor (with 4 poles) in May-Jun 1885. Its principles are now applied in the majority of today's a.c. motors, yet he refused to patent his invention, and preferred to place it at the service of everyone.« |
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.
#brainteasers #math #numbermania
Find number abc
If c4bab + 4b5ca = a2aa8c find number abc. Multiple solutions may exist.
#brainteasers #math
Find the right combination
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
#brainteasers #mastermind
Calculate the number 1520
NUMBERMANIA: Calculate the number 1520 using numbers [6, 9, 9, 7, 96, 634] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
#brainteasers #math #numbermania
MAGIC SQUARE: Calculate A-B+C
The aim is to place the some numbers from the list (9, 11, 13, 15, 17, 21, 45, 47, 53, 65, 77) 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.
#brainteasers #math #magicsquare
Find number abc
If 6ac53 + 6c7a6 = 12aa3b find number abc. Multiple solutions may exist.
#brainteasers #math
