Daily Brain Teasers for Friday, 13 February 2026
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puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, stereograms, ... |
Calculate the number 2159
NUMBERMANIA: Calculate the number 2159 using numbers [5, 8, 4, 2, 27, 278] 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 (15, 16, 19, 32, 33, 36, 44, 69, 70, 73, 78) 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 b0a78 + 6ac66 = 110cbb find number abc. Multiple solutions may exist.
#brainteasers #math
Invisible
A psychiatrist's secretary walked into his study and said, "There's a gentleman in the waiting room asking to see you. Claims he's invisible."
The psychiatrist responded, "Tell him I can't see him."
What a winning 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
Millikan Oil Drop ExperimentIn 1912, Robert Millikan began collecting data from his famous oil drop experiment. On this day he gathered observations on the first of the 58 drops he ultimately published. Millikan used his measurements of the motion of oil drops within an electric field to estimate the fundamental unit of charge. He earned the Nobel Prize for Physics in 1923 for his pioneering measurements of the charge on the electron. |
Calculate the number 1603
NUMBERMANIA: Calculate the number 1603 using numbers [2, 9, 2, 4, 15, 254] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
#brainteasers #math #numbermania
Find number abc
If 9c8c9 + a8025 = ba590a find number abc. Multiple solutions may exist.
#brainteasers #math
Which is a winning combination of digits?
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 352
NUMBERMANIA: Calculate the number 352 using numbers [7, 1, 3, 5, 14, 847] 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, 16, 24, 29, 32, 36, 40, 61, 70, 73, 81, 93) 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 b710b + b153a = 1c8ba0 find number abc. Multiple solutions may exist.
#brainteasers #math
