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The Most Difficult Tasks (page 5)puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 41 to 50. |
Find number abc
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If 84b40 + 4c8ba = acb6aa find number abc. Multiple solutions may exist. 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/2026/06/30/mastermind-1782777901.png','/What-a-winning-combination/8761'))
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/2026/06/29/numbermania-1782691501.png','/calculate-the-number-1520/8760'))
NUMBERMANIA: Calculate the number 1520 using numbers [3, 4, 9, 1, 78, 182] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. 
English lessons
A missionary suddenly realizes that the one thing he hasn't yet taught the natives he serves is how to speak English, so he takes the chief for a walk in the jungle.
He points to a tree and says to the chief: "This is a tree." The chief looks at the tree and grunts: "Tree."
The missionary is pleased with the response. They walk a little farther and the missionary points to a rock and says: "This is a rock."
Hearing this, the chief looks and grunts: "Rock."
The missionary is really getting enthusiastic about the results when he hears a rustling in the bushes.
As he peeks over the top, he sees a couple of the natives in the midst of heavy sexual activity. Flustered, the missionary quickly says to the chief: "Riding a bike."
The chief looks at the preoccupied couple briefly, pulls out his blowgun and kills them.
The missionary goes ballistic and yells at the chief that he has spent years teaching the tribe how to be civilized and kind to each other.
"How could you kill these people in cold blood that way?" he demands.
"My bike," the chief replies.
Find number abc
)
If 699a9 - 5cc46 = b658c find number abc. Multiple solutions may exist. 
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/2026/06/27/mastermind-1782518701.png','/Which-is-a-winning-combination-of-digits/8758'))
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 1352
. Each of the numbers can be used only once.','/archive/2026/06/26/numbermania-1782432302.png','/calculate-the-number-1352/8757'))
NUMBERMANIA: Calculate the number 1352 using numbers [5, 2, 2, 6, 27, 601] 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/2026/06/25/magic-square-1782345970.png','/MAGIC-SQUARE-Calculate-A-B-C/8756'))
The aim is to place the some numbers from the list (3, 7, 8, 11, 27, 30, 31, 32, 34, 35, 42, 48) 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. Find number abc
)
If c3294 + bba8c = aa9479 find number abc. Multiple solutions may exist. 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/2026/06/23/mastermind-1782173101.png','/Which-is-a-winning-combination-of-digits/8754'))
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 8628
. Each of the numbers can be used only once.','/archive/2026/06/22/numbermania-1782086702.png','/calculate-the-number-8628/8753'))
NUMBERMANIA: Calculate the number 8628 using numbers [5, 4, 5, 4, 50, 937] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. 
