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The Most Difficult Tasks (page 13)puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 121 to 130. |
Find number abc
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If 39094 + 5aa93 = 90b8c 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/2026/05/09/mastermind-1778285101.png','/Find-the-right-combination/8712'))
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 4333
. Each of the numbers can be used only once.','/archive/2026/05/08/numbermania-1778198701.png','/calculate-the-number-4333/8711'))
NUMBERMANIA: Calculate the number 4333 using numbers [3, 2, 5, 4, 60, 158] 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!"
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/2026/05/07/magic-square-1778112325.png','/MAGIC-SQUARE-Calculate-A-B-C/8710'))
The aim is to place the some numbers from the list (1, 10, 12, 13, 15, 16, 19, 62, 64, 68) 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
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If 9b003 + 9036b = cab36a 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/2026/05/05/mastermind-1777939501.png','/Which-is-a-winning-combination-of-digits/8708'))
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 994
. Each of the numbers can be used only once.','/archive/2026/05/04/numbermania-1777853101.png','/calculate-the-number-994/8707'))
NUMBERMANIA: Calculate the number 994 using numbers [3, 9, 3, 8, 92, 555] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. Find number abc
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If 5ca4a - bbc8c = 34b53 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/2026/05/02/mastermind-1777680302.png','/Find-the-right-combination/8705'))
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 6943
. Each of the numbers can be used only once.','/archive/2026/05/01/numbermania-1777593901.png','/calculate-the-number-6943/8704'))
NUMBERMANIA: Calculate the number 6943 using numbers [7, 5, 3, 7, 14, 685] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. 
