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The Most Difficult Tasks (page 5)puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 41 to 50. |
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/2026/08/06/magic-square-1785974726.png','/MAGIC-SQUARE-Calculate-A-B-C/8797'))
The aim is to place the some numbers from the list (20, 21, 23, 25, 30, 31, 35, 65, 66, 70) 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 880c7 - bb71a = 5cbb5 find number abc. Multiple solutions may exist. Calculate the number 2753
. Each of the numbers can be used only once.','/archive/2026/08/03/numbermania-1785715501.png','/calculate-the-number-2753/8794'))
NUMBERMANIA: Calculate the number 2753 using numbers [4, 2, 2, 4, 62, 905] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. 
I Know the Truth
At school, Little Johnny was told by a classmate that most adults hide at least one dark secret and this makes it very easy to blackmail them merely by saying, "I know the whole truth."
So Little Johnny decides to try it out. When he arrives home from school that day, he says to his mother, "I know the whole truth." His mother looks shocked, quickly finds $20, and gives it to him, saying, "Just don't tell your father."
Quite pleased, Little Johnny waits for his father to get home from work, and greets him with, "I know the whole truth." His father looks shocked, quickly finds $40, and gives it to him, saying, "Just don't tell your mother."
The next morning, Little Johnny is on his way to school when he sees the mailman at his front door. The boy decides to try again. "I know the whole truth."
The mailman drops his mailbag, throws opens his arms, and says, "Then come give your real daddy a nice big hug!"
Find number abc
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If 972cb - 17aca = 79c94 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/2026/08/01/mastermind-1785542701.png','/What-a-winning-combination/8792'))
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 883
. Each of the numbers can be used only once.','/archive/2026/07/31/numbermania-1785456302.png','/calculate-the-number-883/8791'))
NUMBERMANIA: Calculate the number 883 using numbers [5, 2, 9, 7, 27, 823] 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/2026/07/30/magic-square-1785369949.png','/MAGIC-SQUARE-Calculate-A-B-C/8790'))
The aim is to place the some numbers from the list (12, 13, 16, 20, 21, 24, 29, 30, 32, 33, 59) 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. 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/2026/07/28/mastermind-1785197101.png','/Which-is-a-winning-combination-of-digits/8788'))
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 648
. Each of the numbers can be used only once.','/archive/2026/07/27/numbermania-1785110701.png','/calculate-the-number-648/8787'))
NUMBERMANIA: Calculate the number 648 using numbers [6, 1, 8, 4, 36, 267] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. Find number abc
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If b7aaa + 3b30c = 489a8 find number abc. Multiple solutions may exist. 
