Daily Brain Teasers for Thursday, 23 October 2025
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puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, stereograms, ... |
MAGIC SQUARE: Calculate A-B+C
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.
Find number abc
If 6ac53 + 6c7a6 = 12aa3b find number abc. Multiple solutions may exist.
Calculate the number 1609
NUMBERMANIA: Calculate the number 1609 using numbers [8, 4, 6, 1, 43, 789] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Immaculate Misconception
A woman starts dating a doctor. Before too long, she becomes pregnant and they don't know what to do. About nine months later, just about the time she is going to give birth, a priest goes into the hospital for a prostate gland infection.
The doctor says to the woman: "I know what we'll do. After I've operated on the priest, I'll give the baby to him and tell him it was a miracle."
"Do you think it will work?" she asks.
"It's worth a try," he says.
So, the doctor delivers the baby and then operates on the priest. After the operation he goes in to the priest and says: "Father, you're not going to believe this."
"What happened?" asks the priest.
"You gave birth to a child!"
"But that's impossible!" says the priest.
"I just did the operation," insists the doctor. "It's a miracle! Here's your baby."
About 15 years go by, and the priest realizes he must tell his son the truth. One day, he sits the boy down and says: "Son, I have something to tell you. I'm not your father."
The son says: "What do you mean, you're not my father?"
The priest replies: "I am your mother. The archbishop is your father."
Find number abc
If 62a66 + a46cb = 13a42c find number abc. Multiple solutions may exist.
Herbert A. HauptmanDied 23 Oct 2011 at age 94 (born 14 Feb 1917).Herbert Aaron Hauptman was an American mathematician and crystallographer who shared the 1985 Nobel Prize for Chemistry with Jerome Karle, with whom he collaborated, “for their outstanding achievements in the development of direct methods for the determination of crystal structures.” They developed mathematical methods for interpreting the patterns formed on photographic film by X rays diffracted through a crystalline chemical compound to determine its molecular structure. The knowledge of structure has two great benefits. One, in understanding the function of molecules in biological contexts, expecially those of “signal - receptor processes.” These include such processes as enzyme activity; antigen - antibody; and scent substance - scent receptor. Another is in studying the mechanism and chemical dynamics of reactions.« |
What a winning combination?
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 6332
NUMBERMANIA: Calculate the number 6332 using numbers [9, 8, 4, 8, 39, 762] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
MAGIC SQUARE: Calculate A*B+C
The aim is to place the some numbers from the list (24, 25, 27, 29, 30, 32, 57, 66, 67, 69, 75) 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 bb31c + 2b14a = 8a4bc find number abc. Multiple solutions may exist.
What a winning combination?
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 768
NUMBERMANIA: Calculate the number 768 using numbers [2, 1, 9, 5, 42, 380] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
