Daily Brain Teasers for Friday, 21 November 2025
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puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, stereograms, ... |
Calculate the number 9896
NUMBERMANIA: Calculate the number 9896 using numbers [5, 7, 1, 6, 32, 828] 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 (5, 6, 11, 19, 20, 25, 26, 27, 28, 32) 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 c51a7 + 10bbc = 460b0 find number abc. Multiple solutions may exist.
#brainteasers #math
April Fools’ Day Pranks - Tell your kid you bought them an iPad
I’m sorry, sweetie, did I say iPad? I meant I bought you an eye pad.
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
Edison's phonographIn 1877, Thomas Edison announced his invention of his “talking machine” - the tin-foil cylinder recorder that preceeded the phonograph. He appears to have envisioned it as a business dictation machine. In Sep 1877, he wrote that its purpose was “to record automatically the speech of a very rapid speaker upon paper; from which he reproduces the same Speech immediately or years afterwards preserving the characteristics of the speakers voice so that persons familiar with it would at once recognize it.” The indented tin foil, however, would survive only a few playings. By the first public showing of a phonograph, which took place in New York City in early Feb 1878, its practical applications had not yet been realized.[Image: from Scientific American, 22 Dec 1877] |
Calculate the number 751
NUMBERMANIA: Calculate the number 751 using numbers [7, 3, 9, 2, 32, 665] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
#brainteasers #math #numbermania
Find number abc
If 380ab + c9bac = 97b3a find number abc. Multiple solutions may exist.
#brainteasers #math
Calculate the number 5140
NUMBERMANIA: Calculate the number 5140 using numbers [2, 6, 1, 7, 12, 648] 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 (7, 8, 9, 16, 26, 27, 31, 32, 34, 39, 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 abc2b + 77c2a = c3a2a3 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
