Puzzling Stack Exchange
Puzzling Stack Exchange

Questions tagged [calculation-puzzle]

A puzzle that involves numerical calculations, such as multiplication and addition. Use with the [mathematics] tag.

A calculation puzzle is one that involves numerical calculations of some sort, generally using the basic mathematical operations: addition, subtraction, multiplication, and division.

Although involving math, these questions CANNOT be math homework/textbook style questions as these are off-topic for this site. See Are math-textbook-style problems on topic? for more details.

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Where is Jennifer's husband?

Jennifer is 21 years older than her son Douglas. 6 years from now, Jennifer will be 5 times as old as Douglas. Question: Where is Jennifer's husband most likely to be right now?
cissharp
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The weight of the Seven Dwarfs

Snow White offered the Seven Dwarfs a weighing machine. One after the other, they went on the machine and they wrote their weights on a piece of paper. Then they gave it to Snow White, but without writing their names: 22 kilograms 14 kgs 16 kgs 11…
IAmInPLS
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In a certain language if the word STABILIZE is coded as JHXDJQSYA, then how is the word RESPONSES coded in that language?

In a certain language if the word STABILIZE is coded as JHXDJQSYA, then how is the word RESPONSES coded in that language? LRCRPOQDP PDQOPLRCR LRCRPPDQO LQCRPPDQO LRCRPPDOQ I tried it STABILIZE - 19|20| 1| 2| 9|12| 9|26| 5| JHXDJQSYA - 10|…
George Ushan
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4 Attempts to Guess a Number Between 1-15

Is there a way to find a number between 1-15 in 4 attempts? In each attempt you can guess a range / combination of numbers and you will get an answer if the number is in that range / combination or not. You are not allowed to ask directly which…
user64031
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Word Number Puzzle

If letters are factors of equations: zero = 0 one = 1 two = 2 three = 3 four = 4 five = 5 six = 6 seven = 7 eight = 8 nine = 9 ten = 10 twelve = 12 fifteen = 15 twenty = 20 thirty = 30 forty = 40 sixty = 60 hundred = 100 thousand = 1000 million =…
TSLF
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Wreckage of a ship

The ancestor of the unfamous Boaty McBoatface was wrecked in the Atlantic ocean during the 20th century, the $X$th day of the $Y$th month of the year 1900 + $Z$. It had $U$ propellers but no more than 10, $V$ funels but no more than 10 and there…
IAmInPLS
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For how long did Lisa walk?

Lisa gets picked up from work by her husband at exactly 4 pm every day. One day Lisa finished work half an hour earlier and started walking to meet up with her husband. She met her husband on the way, and they drove home together. When they arrived…
Stewie Griffin
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Dragon lizards in Hogwarts

Albus Dumbledore keeps 274 dragon lizards in his terrarium in Hogwarts. One day he removes two thirds of the male lizards from the terrarium; it is easy for him to tell the males apart from the females since each male has 12 spikes and each female…
Haobin
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My Three Children

The sum of the ages of my three children is 40. Though the ages of my two daughters are relatively prime (i. e. they have no common divisor), the age of each of them does have a common divisor greater than 1 with my son´s age. How old are my three…
Bernardo Recamán Santos
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Directions on an infinite compass rose

An old sailor, by the name of John, was in his attic with his bright young great-nephew Stewart, showing him all the old tools they used to use while at sea. Stewart was fascinated by all the trinkets. One item caught his eye, which was a giant…
user88
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Somebody hacked my calculator

Harvey the hacker struck again. After powering on my calculator, I entered the Keystrokes in the order shown below. Instead of the Expected Result, I got the Hacked Result. What will be the last Hacked Result? Update / Hints: As mentioned in the…
FlanMan
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Who gets more money?

There are two people eating bread. One of them has 5 loaves of bread; the other one has 3. They invited a third person to eat with them. They ate all 8 loaves of bread, and out of appreciation he gave them 8 cents. How should they divide the money…
Dear
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A self-referring number

Find a ten-digit number with the number of zeros in it as the most significant (leftmost) digit, the number of ones as the second most significant digit etc.
Angkor
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Pairs of Bogotá Numbers

A Bogotá number is a positive integer equal to some smaller number, or itself, times its digital product, i.e. the product of its digits. For example, 138 is a Bogotá number because 138 = 23 x (2 x 3). 24 and 25 are the first instance of two…
Bernardo Recamán Santos
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Divisible Dates

The day of the month, and the month of the year, often simultaneously divide the year. Most recently it happened on January 3, 2019 because both 1 (January) and 3 divide 2019. In our era, since 1/1/1, which years have had the most such dates?
Bernardo Recamán Santos
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