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Questions tagged [calculation-puzzle]

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

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5
votes
3answers
1k views

A pokemon puzzle [closed]

You have recently caught N Pokemon and you also have M Pokemon candy bars. You can evolve any of your Pokemon by paying X candy bars. Alternatively, you can sell any of your Pokemon for a price of ...
8
votes
3answers
2k views

Fully confused calculation

The sum of a three digit number (ABC) and another three digit number (DEF), where DEF is obtained by thoroughly shuffling* the original three digits of ABC, is 1000. Then, find all possible such pairs ...
2
votes
1answer
248 views

Extension to The grazing cows of Sir Isaac Newton

There is an earlier question, The grazing cows of Sir Isaac Newton, which says: Sir Isaac Newton's book "Arithmetica Universalis" contains the following famous puzzle: In $4$ weeks, $12$ ...
4
votes
1answer
222 views

systematic number removal [duplicate]

The whole, natural numbers 1 through 50 are written on a board. The following operation is performed 49 times: select any two of the numbers on the board and write the absolute value of their ...
0
votes
1answer
249 views

Fuzzy's Fizzy Dilemma [closed]

Fuzzy the Fuzzball's friends was going to the Fuzzball Festival, and of course he went along. While there, he saw the most curious display. The booth was displaying brand new types of Fuzz. There was ...
8
votes
2answers
380 views

Elementary vowel equations

Challenge Solve the following equations by converting to standard form (see below): ** eeeeee = aeeeeiiiouu ...
2
votes
2answers
192 views

How can i move forward (kenken)

I can't seem to find a next step to logically come to without guesswork. Any ideas on how to move forward?
3
votes
3answers
386 views

Dividing money in school [closed]

A businessman instituted an annual award in a city school, with part of the award given to the school itself to improve its facilities. It was stated that if a student from a wealthy family were to ...
-3
votes
1answer
144 views

Water Difference

While solving a puzzle, I misinterpreted the whole thing and ended up creating a new harder puzzle. Here it is: You have 2 cups filled with water, cup A is 5oz and cup B is 3oz. How can you get one ...
-3
votes
1answer
115 views

Calculate cost of excess water consumed [closed]

100 Liters of water is available equally in a month for consumption among 5 members @ 1 dollar per liter. If some members don't use their own available 20 liters, it can be used by the others at the ...
25
votes
3answers
2k views

A game of multiplication and addition

Carol is playing a game with Alice and Bob. She secretly chooses two integers between 1 and 10 and gives the sum to Alice and the product to Bob. After some time, the following discussion occurs: ...
4
votes
1answer
448 views

Analyzing Single-Elimination Tournaments

I know there are many questions/answers about single elimination tournaments out there, but I wanted to approach this question in a more holistic way. For a single-elimination tournament with N ...
5
votes
3answers
702 views

Can you find the value of the question mark$\color{red}?$

Puzzle: Find the value of the question mark $\color{red}?$. $$(2, 13, 47)$$ $$(5, 7, 19)$$ $$(8, 1, \color{red}?)$$ Hint 1: $\color{red}?$ is a prime. Hint 2: $\color{red}?$ is a cyclops. ...
2
votes
1answer
265 views

The A-B chocolate puzzle!

Imagine you have 2 types of chocolates (A and B). You randomly pick up two chocolates at once from your bag in a specific pattern. If the same type of chocolates come out, you give them both to your ...
2
votes
3answers
286 views

Sufficient time to fill the bucket [closed]

Suppose that we have a pierced bucket, and that the hole empties the bucket in four hours. We place the bucket under two faucets at the same time. If the bucket weren’t pierced, the first faucet would ...
7
votes
3answers
937 views

What is the next number to appear in this sequence?

$1, 1, 0, -2, 4, 18, 328, 107638 ,?$ This problem can be complex, use your imagination. Hint: Hint 2: Hint 3: Hint 4: Hint 5: Hint 6: Hint 7:
9
votes
5answers
8k views

How Will You Get 100 Fruits in Rs.100?

Source: https://www.bissoy.com/720699/ For Rs. 0.5 you get 1 Cherry. For Rs.3 you get 1 Orange. For Rs.5 you get 1 Watermelon. Your mother told you to get 100 fruits for Rs.100. ...
5
votes
3answers
2k views

Mathematics IQ puzzle, solving puzzle by looking at neighboring digits [closed]

Can anyone solve this puzzle? I have tried many times but I could not find any symmetry or sequence. \begin{array} {|c|c|c|} \hline 3&25&5\\ \hline 16&9&6\\ \hline 125&36&18\\ ...
4
votes
10answers
15k views

How to prove that this man has a profit of 20 and not 10?

This is not actually a puzzle per se, but I'm asking for an explanation about the puzzle's answer. The puzzle goes like this: A man bought a goat for 60. He then sold it for 70. Later, he bought ...
2
votes
2answers
1k 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
267 views

What will be the answer?

What is the answer of the given puzzle? Please send solution. ...
6
votes
3answers
573 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
277 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
296 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
697 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
373 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
642 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
698 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
260 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
295 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
299 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 ...
5
votes
2answers
701 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
240 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
769 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
14k 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
149 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
230 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
3k 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
153 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 ...