Questions tagged [calculation-puzzle]

A puzzle that involves numerical calculations, such as multiplication and addition.

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2
votes
2answers
621 views

Find the next number in the sequence below?

Find the next number in the sequence below: 298 209 129 58 ? Source: Briddles.com
2
votes
9answers
2k views

How to use the numbers 3, 5, 6, and 7 to get 100? [closed]

Any mathematics symbols and processes to use the numbers 3, 5, 6, and 7 once each to get 100.
49
votes
8answers
15k views

The Cucumber Paradox

Suppose you have 100 lbs of cucumbers and these cucumbers consist of 99% water. You decide to leave the cucumbers in the sun for a while until they consist of 98% water. You bring the cucumbers back ...
-11
votes
2answers
251 views

What will be the answer?

What is the answer of the given puzzle? Please send solution. ...
6
votes
3answers
568 views

Find the value of the addition of dice [closed]

Given these: Find the rule, and provide the answer to "?" (the last row). EDIT:Even though "+" denotes addition, it should not be taken in a tradition sense. The positioning and pattern could affect ...
7
votes
1answer
1k views

Find number by solving the pattern

I need to solve the pattern in given format 98 | 54 | 78 7641 | 3120 | 5402 714 | 494 | 726 ...
7
votes
3answers
265 views

Integers around a circle with consecutive pairs differ to a square

Inspired by this puzzle : Integers around a circle with consecutive pairs adding to a square The integers 1 to 50 are placed around a circle in such a way that the difference of any two of them which ...
4
votes
2answers
2k views

How many Donuts? [closed]

Three friends went on a camping trip and on the way they bought N donuts 🍩. They put them in their tent 🎪, and went swimming 🏊. One of them came and divided the donuts in to 3 equal parts, fed ...
4
votes
1answer
291 views

Magic: the Gathering Challenge: Getting Stuffy In Here

first time posting a puzzle in a while, thought I'd bring back some MtG related puzzles. Enjoy! BACKGROUND: The usual magic rules apply here. Please be explicit in mana usage in your solution ...
5
votes
1answer
204 views

Replacing the chip problem [duplicate]

There are $13$ white, $15$ black, $17$ red chips on a table. In one step, a person may choose $2$ chips of different colors and replace each one by a chip of the third color. Can all chips become the ...
10
votes
5answers
1k views

How long was my vacation?

The weather during my vacation was as follows: It was cloudy on 13 different days, but it was never cloudy for an entire day Cloudy mornings were followed by clear afternoons Cloudy ...
4
votes
2answers
694 views

What is logic behind this?

If, 1111 = r 2222 = t 3333 = e 4444 = n 5555 =? What is the output of 5555? What calculation needed to calculate alphabet behind 5555?
5
votes
2answers
321 views

Smallest number you cannot make using 1, 2, 3, 4, 5, and the four basic operations

Given how simple this is, I'm not sure if it has been asked before. But I did try searching everywhere and didn't come up with anything. It is based on these two questions I happened to stumble upon: ...
7
votes
1answer
279 views

Another Simple Math Problem? Really?

Yup, I'm adding yet another Simple Math Problem to the recent trend. Here ya go! Given that: $$\begin{array}{ccccccc} \begin{array}{c} 1-1=0\\ 1+1=2\\ 1+6=7\\ 2+5=7\\ 5+1=6\\ 6-5=1\\ 9-7=2 \end{array}...
6
votes
5answers
2k views

Simple Math Problem #2

Link to previous puzzle Simple Math Problem #1 (not linked to this one) Here is another simple math problem. Can you solve it? Examples: $25 + 12 = 33$ $37 + 13 = 44$ $40 + 24 = 66$ $64 + 26 = 88$ ...
10
votes
1answer
637 views

Simple Math Problem #1

Here is a simple math problem. Can you solve it? Examples: 678+57-24*2 = 7 265+34-12*3 = 8 328+58-22*1 = 12 Problem: 541+13-21*0 = ? HINT 1: Will see if this hint makes any sense or will edit ...
0
votes
3answers
677 views

How do I solve this odd puzzle?

I need help. Try to solve this puzzle. It's a blend of mathematics and words. The goal of word math problems is to assign each letter an integer value, 0-9. An example is below. Example: ...
12
votes
1answer
258 views

Difference or addition on a rose petals

Arrange the numbers 1 to 20 onto the rose petals using these rules : Yellow petals contain odd numbers, white petals contain even numbers. The outer petals are the difference or addition of the inner ...
0
votes
1answer
289 views

5555=? Which letter goes in place of the question mark?

I have found this puzzle on the internet but I didn't get any answer yet, so help me out. For rules see the given image: Here you can either give clues or may explain your answer.
1
vote
2answers
298 views

The “Perfect” Lineup

Alice is the head of her high-school quiz bowl league. She is in charge of choosing who will play in the next quiz bowl tournament. She has executive authority about who plays when, and she can change ...
6
votes
2answers
615 views

Legal advise for a family dilemma

"A client of mine," said a lawyer, "was on the point of death when his wife was about to present him with a child. I drew up his will, in which he settled two-thirds of his estate upon his son (if it ...
1
vote
4answers
2k views

what will be the answer for 888=? [closed]

I found this puzzle on another website and I wanted to share it here. I will post the source link after a week to avoid spoilers. Here are some rules: if: ...
-4
votes
6answers
1k views

How is this possible? [closed]

One day, I was going to school. I saw an old man. He said that he will pay me if I answered his question properly. If we add 2 into 10 it will be 8, i.e. 10+2=8 If we subtract 2 from 10 it ...
4
votes
1answer
232 views

How to tell if a Mathematical Rubiks puzzle is solvable

I recently came up with a series of mathematical puzzles based loosely on Rubik's puzzles(or should I say combination puzzles). They go like this: you have an n x n group of numbers where you can ...
30
votes
1answer
732 views

Integers around a circle with consecutive pairs adding to a square

The integers 1 to 50 are placed around a circle in such a way that the sum of any two of them which are adjacent is a perfect square. Of these integers, the even numbers are then removed. Restore them....
6
votes
16answers
12k views

How do you get 23 using the numbers 1, 2, 3 and 5?

You can only use Addition, Subtraction, Multiplication, Division. This is for a math project for my daughter. You can only use the numbers once and all numbers do not need to be used.
17
votes
2answers
4k views

Doomsday will occur in the year with a triple blue moon

A group of men are working and counting on a very serious prophecy, which says "Doomsday will occur in the year with a triple blue moon". When will Doomsday occur? Note : A blue moon is a second ...
2
votes
1answer
147 views

Instructing People to use minnimum time for a task? [duplicate]

There are 5 persons standing on a side of tunnel. A, B, C, D, E Each takes 10, 30, 15, 20, 29 minutes to cross tunnel ...
-3
votes
5answers
228 views

Interesting card combinations [closed]

In a normal pack of playing cards (without jokers), the probabilities of the following events are the same: (1) Drawing a set of 4 different cards (irrespective of its color and suit) - let us call ...
3
votes
6answers
2k views

Upside-Down Number Problem

These are numbers that can also be read upside down as the same number, or different number: 0, 1, 6, 8, 9, 10, 11, 16, 18, so on. Each number can only be used once. Using these numbers, try to get ...
-2
votes
3answers
149 views

Redesign an analog clock [closed]

An odd mathematician and engineer decides to redesign an analog clock. It now has 2 periods of 10 hours, each hour is divided ...
4
votes
2answers
443 views

Boggling googling

I'm a number for you to evaluate, Googling 'me' gives the drop off the Empire State, Though the great Google finds no results for me, I'm just a pure integer value you'll see. What number am ...
1
vote
3answers
543 views

What is the next number in the following sequence?

1, 6, 5, 3, 4, 1, 2, 2, ? Hint: the task is pattern recognition using basic mathematical operations.
4
votes
2answers
524 views

mystery operations

1.  3 __ 2 __ 36 __ 4  =  67 2.  3 __ 2 __ 36 __ 4  =  150 3.  3 __ 2 __ 36 __ 4  =  176 4.  3 __ 2 __ 36 __ 4  =  71 Fill in the blanks ...
9
votes
1answer
456 views

Arrange numbers into the quadrilaterals

Arrange numbers 1 to 14 to the quadrilaterals, such that: The difference between 2 numbers in squares having a common edge or corner is greater than 2. Numbers inside the green quadrilaterals are ...
4
votes
3answers
1k views

Gumball Machine Logic Math Puzzle

You walk into an antique shop and find an unusual gumball machine. On the back of the gumball machine you can set and lock five dials with the following labels: Percentage (0% through 100%) Pink (0 ...
2
votes
1answer
216 views

Generate a valid string

I have been observing her for just over a week now. She had seen me but didn't know she was being watched. As people pass she hands them a piece of paper. Some even stop and put money in a cigar box ...
0
votes
1answer
248 views

Help with this puzzle?

Here is a set of problems that I encountered during an examination. Can anybody help me find the numbers where the '??' symbols are? $\begin{bmatrix}10&6&2\\15&31&?? \\15&96&7 ...
14
votes
4answers
3k views

Mother and Daughter

A mother (not yet a centenarian) and her daughter (who happens to share her mother's birthday) are both a prime number of years old. Moreover, in their lifetimes there have been at least a dozen other ...
15
votes
2answers
2k views

What am I worth as a TART?

I hope it's not too easy. As CAKE I'm worth 573,566. As PIE I'm worth 33,062. What am I worth as a TART? Note : It's not a word game.
5
votes
5answers
502 views

Move a number's position to get the right equation

$62-5+3*2=25$ Move a number's position in order to get the right equation.
2
votes
2answers
304 views

Macbook air falls off x floors and survives! [duplicate]

You've just bought an anti-shock skin for your macbook air and want to make a review video for your vlog showing how good it is at absorbing shocks. The skin has a special property that either ...
7
votes
2answers
2k views

Prime sums in a 4 x 4 board

Place the integers 1 to 16 in the sixteen cells of a 4 x 4 board so that the sum of any four numbers in a row or column is a different prime.
5
votes
1answer
489 views

Rolling a dice - Expectation Question [closed]

I heard / read / acquired this puzzle from somewhere: Roll a die, win $2\times$ the value of the face if it is an even number, or win $1\times$ the value of the face if it is an odd number. How ...
-2
votes
2answers
184 views

Doubles and Trebles [closed]

There are two ponds having lotus flowers - pond A and pond B. The property of the flowers of pond A is such that they get doubled (that is twice) in number every day as compared to previous day (6:00 ...
3
votes
2answers
230 views

Everything leads to “one” number

You get an invitation from an Institute of Mathematics and you are told if you can solve a simple puzzle you can be part of their elite institution. You have to fill the blank. $6 \rightarrow 6$, ...
4
votes
2answers
510 views

Man selling sheep

A man with 90 sheep wants to sell them in a market 30km away from his farm. He went searching for trucks to load his sheep and he found out that every truck can carry 30 sheep at a time, but he will ...
4
votes
3answers
3k views

Solving a Rullo Puzzle

How can I solve in a (relatively easy) way, a Rullo puzzle? (Screenshot below) Rules: Enable or disable a circular number (pink is enabled) in order to make the row or column match the sum on the ...
9
votes
2answers
549 views

What is a Scheming Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it a Scheming Word™. Use the examples ...
2
votes
3answers
216 views

Menu subset puzzle creation help

I'm having trouble finding out the best way to create the lists of numbers for the puzzle I'm creating. There are 2 sets of 13 integers (from 1 to 50 inclusive). Call these $A$ and $B$. There exists ...