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The Most Difficult Tasks (page 3)puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 21 to 30. |
MAGIC SQUARE: Calculate A-B*C
 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.','/archive/2026/07/23/magic-square-1784765144.png','/MAGIC-SQUARE-Calculate-A-B-C/8783'))
The aim is to place the some numbers from the list (17, 20, 22, 23, 26, 28, 34, 41, 44, 46, 82) 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: 0
#brainteasers #math #magicsquare
Find number abc
)
If 5aa85 - a4c55 = ac53b find number abc. Multiple solutions may exist. Correct answers: 0
#brainteasers #math
What a winning combination?
. 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.','/archive/2026/07/21/mastermind-1784592301.png','/What-a-winning-combination/8781'))
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. Correct answers: 0
#brainteasers #mastermind
New savings account...
Mother decided that 10-year-old Cathy should get something 'practical' for her birthday.
"Suppose we open a savings account for you?" mother suggested. Cathy was delighted.
"It's your account, Darling," mother said as they arrived at the bank, "so you fill out the application."
Cathy was doing fine until she came to the space for 'Name of your former bank.' After a slight hesitation, she put down, 'Piggy.'
Calculate the number 6585
. Each of the numbers can be used only once.','/archive/2026/07/20/numbermania-1784505901.png','/calculate-the-number-6585/8780'))
NUMBERMANIA: Calculate the number 6585 using numbers [9, 7, 7, 9, 62, 790] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. Correct answers: 0
#brainteasers #math #numbermania
Find number abc
)
If a896c + 4b7a5 = 7a685 find number abc. Multiple solutions may exist. Correct answers: 0
#brainteasers #math
Which is a winning combination of digits?
. 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.','/archive/2026/07/18/mastermind-1784333101.png','/Which-is-a-winning-combination-of-digits/8778'))
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. Correct answers: 0
#brainteasers #mastermind
Calculate the number 3160
. Each of the numbers can be used only once.','/archive/2026/07/17/numbermania-1784246701.png','/calculate-the-number-3160/8777'))
NUMBERMANIA: Calculate the number 3160 using numbers [1, 8, 1, 2, 73, 335] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. Correct answers: 0
#brainteasers #math #numbermania
MAGIC SQUARE: Calculate A*B+C
 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.','/archive/2026/07/16/magic-square-1784160344.png','/MAGIC-SQUARE-Calculate-A-B-C/8776'))
The aim is to place the some numbers from the list (6, 17, 18, 20, 21, 28, 29, 31, 53, 56, 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: 0
#brainteasers #math #magicsquare
Find number abc
)
If ab12c + ba6b3 = 1b3cc0 find number abc. Multiple solutions may exist. Correct answers: 0
#brainteasers #math
What a winning combination?
. 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.','/archive/2026/07/14/mastermind-1783987501.png','/What-a-winning-combination/8774'))
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. Correct answers: 0
#brainteasers #mastermind
