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The Most Difficult Tasks (page 23)puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 221 to 230. |
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/2025/11/27/magic-square-1764201927.png','/MAGIC-SQUARE-Calculate-A-B-C/8551'))
The aim is to place the some numbers from the list (5, 12, 15, 21, 24, 26, 27, 29, 33, 35) 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. 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/2025/11/20/magic-square-1763597127.png','/MAGIC-SQUARE-Calculate-A-B-C/8544'))
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. 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/2025/11/13/magic-square-1762992345.png','/MAGIC-SQUARE-Calculate-A-B-C/8538'))
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. 
Chinese Jews
Sid and Al were sitting in a Chinese restaurant.
"Sid," asked Al, "Are there any Jews in China?"
"I don't know," Sid replied. "Why don't we ask the waiter?"When the waiter came by, Al said, "Are there any Chinese Jews?"
"I don't know sir, let me ask," the waiter replied and he went into the kitchen.
He quickly returned and said, "No, sir. No Chinese Jews."
"Are you sure?" Al asked.
"I will check again, sir." the waiter replied and went back to the kitchen.
While he was still gone, Sid said, "I cannot believe there are no Jews in China. Our people are scattered everywhere."
When the waiter returned he said, "Sir, no Chinese Jews."
"Are you really sure?" Al asked again. "I cannot believe there are no Chinese Jews."
"Sir, I ask everyone," the waiter replied exasperated. "We have orange jews, prune jews, tomato jews and grape jews, but no one ever hear of Chinese jews!"
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/2025/11/06/magic-square-1762387527.png','/MAGIC-SQUARE-Calculate-A-B-C/8531'))
The aim is to place the some numbers from the list (12, 13, 14, 18, 19, 22, 27, 57, 58, 66) 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. 
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/2025/10/30/magic-square-1761782726.png','/MAGIC-SQUARE-Calculate-A-B-C/8524'))
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. Calculate the number 9167
. Each of the numbers can be used only once.','/archive/2025/10/27/numbermania-1761523501.png','/calculate-the-number-9167/8521'))
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. Find number abc
)
If c4bab + 4b5ca = a2aa8c find number abc. Multiple solutions may exist. Find the right 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/2025/10/25/mastermind-1761350701.png','/Find-the-right-combination/8519'))
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. Calculate the number 1520
. Each of the numbers can be used only once.','/archive/2025/10/24/numbermania-1761264301.png','/calculate-the-number-1520/8518'))
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. 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/2025/10/23/magic-square-1761177944.png','/MAGIC-SQUARE-Calculate-A-B-C/8517'))
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. 
