Questions tagged [calculation-puzzle]
A puzzle that involves numerical calculations, such as multiplication and addition.
1
vote
0answers
70 views
Numerical sequence
I need help in solving this sequence: ?, 36, 36, 18, 16, 14, ? I've tried to notice a pattern and saw that 7*2=14
8*2=16, 9×2=18 18×2=36 but after 9x2 the sequence doesn't make sense. I've also ...
1
vote
0answers
126 views
What is the next sequence of numbers?
Seven and seven is forty-two,
Eight and nine are fifty;
Ten and eleven are sixty-two,
And twelve and twelve are five.
What is the next sequence of numbers?
5
votes
1answer
102 views
What is next in the number sequence?
Two and two is four,
But three and three is nine;
Four and four is eighty,
But five and five is none.
What is the next line in the sequence?
9
votes
3answers
4k views
You surely don't want to score 100/100
The Story:
Today, the Maths quizzes are handed out by the teacher.
You got 100/100. Everyone got 100/100.
But you're not happy with it. Everyone's not happy with it.
You want to ...
1
vote
5answers
214 views
Create all numbers from 1-100 by using 1,3,3,7
Create all the numbers from $1$ to $100$ using the numbers $1,$$3,$$3,$ and $7.$
You can only use each number once, except for the $3,$ of which you have two.
You can use addition $(x+y),$ ...
12
votes
8answers
3k views
Create all numbers from 1-100 using 1,3,3,6
Create all the numbers from $1$ to $100$ using the numbers $1$,$3$,$3$, and $6$.
You can only use each number once, except for the $3$, of which you have two.
You can use addition ($x+y$), ...
9
votes
3answers
335 views
A puzzle in kindergarten's book
I found the following puzzle in a kindergarten book:
Can anyone give a clear explanation as to what the answer is and why?
The first time I tried to solve it I got an answer of 6, by noting that the ...
5
votes
5answers
569 views
How do I make numbers 50-100 using only the numbers 2, 0, 1, 9?
Rules
Use ALL the digits in the year $2019$ (you may not use any other numbers except $2, 0, 1, 9$) to write mathematical expressions that give results for the numbers 50 to 100.
You may use the ...
2
votes
5answers
242 views
Find the missing number in grid
When I doing the IQ paper last Sunday, I found an interesting question. Using that I made a different puzzle.
Hint 01:
Hint 02:
Hint 03:
Hint 04:
Text version:
25 13 43
35 66 53
45 -- 63
55 ...
-2
votes
2answers
140 views
Pattern recognition question [closed]
Here is a number sequence with a missing term:
$22$, $44$, $186$, $1458$, $11680$, $?$
The first thing I noticed is that if you take the first term ($22$) do $2 \times 2 = 4$ and that's the ...
2
votes
0answers
91 views
Write $\sqrt{5}$ as sums of powers of $1 + \sqrt{2}$? [closed]
The number $A = 1 + \sqrt{2}$ solve the equation $A^2 = 1 + 2 \sqrt{2} + 2 = 1+2A$. We also have that $$0 < \dots < A^{-2} < A^{-1} < 1 < A < A^2 < \dots $$ The powers are in ...
3
votes
4answers
414 views
What will be the next term in this mathematical sequence?
What will be next in this series?
$$0, 6, 24, 60, 120, 210, ...$$
I've tried it and noticed that the numbers are multiples of six. But I couldn't make a relation between them.
9
votes
2answers
457 views
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 ...
2
votes
1answer
186 views
Help solving a math puzzle table
I am struggling to find the answer.
Here is the source: math logic puzzle phone app.
4
votes
2answers
183 views
5 Digit Code Puzzle
We have a 5 digit code, any place can take 1 2 or 3.
How do I find where the 2 is placed (if placed) knowing this criteria?
1) If the 1st digit is not a 3 then the 2nd is.
2) If the 1st ...
3
votes
1answer
107 views
How many possibilities are there for the buried treasure?
You have discovered a map to some buried treasure on an island the shape of a circle. The map has 9 markers which represent posts situated on the edges of the island.
The 9 posts are located; North, ...
3
votes
2answers
113 views
Simple and intriguing
Five friends are sharing information about the marbles they have attempting to derive the total amount of marbles they own without disclosing to others the amount each own. They decide to do it by ...
2
votes
1answer
90 views
14sums - the diamond standard
My initial question had lots of answers, and my second had too many constraints. So, I have removed some constraints and added another. Same rules as before, but we are now using $[0,6]\cap\mathbb{Z}$....
12
votes
4answers
4k views
Doubling/tripling puzzle: make 1 from 1536 in as few steps as possible
You start with the number 1536. Your mission is to get to 1 in as few steps as possible. At each step, you may either multiply or divide the number you have, by either 2 or 3; but, only if the result ...
1
vote
0answers
42 views
Sequence puzzle in rows [duplicate]
The below is a number puzzle. It should be read left to right, top to bottom.
Question 1: What is the next two rows of numbers?
Question 2: How was this reached?
-1
votes
6answers
483 views
How do I make 76 using only the numbers 2,0,1,9? [closed]
I must use each number 2,0,1,9 (only once) to come up with an answer of 76
5
votes
1answer
112 views
21sums - more constraints
My initial question had lots of answers, as we can practically choose the middle square to be anything we want, and work outwards to the exterior edges, with the corners providing the flexibility ...
5
votes
7answers
1k views
9sums - a logical deduction puzzle
Each set of minuses contains an integer in the range [1,5]. The given numbers are the sum of the surrounding 4 numbers.
--- --- --- ---
13 14 11
--- --- --- ---
11 ...
7
votes
6answers
2k views
Through which number we can remove the question mark?
I'm trying to solve this puzzle but so much confused and can't understand even.Please help me to solve this puzzle and also explain briefly.
10
votes
1answer
1k views
Which two numbers replaces the question mark?
I was solving some number puzzles. I am finding difficulty in solving this puzzle: which two numbers will replace the question marks? I need answer with explanation.
1
vote
2answers
318 views
What is the next number in the given series?
I know that next number questions are not popular here, but this one is tough and I couldn't figure out the pattern. To give an idea one of the questions had a pattern of Prime(Fib(n)).
So this is ...
5
votes
5answers
404 views
Time-Motion puzzle
Time and Motion studies are well established.
Here is an easy question:
It takes 8 men 6 months to build 2 houses at a cost of $50,000.
It takes 10 men 5 months to build 3 houses at a cost of ...
-6
votes
1answer
153 views
100 birds 100 rupies. parrot cost is 5rs, crow cost is 1rs and sparrow cost is 0.05paisa please solve this? [closed]
100 birds 100 rupees. parrot cost is 5 rs, crow cost is 1 rs and
sparrow cost is 0.05 paisa. all 3 birds are required. please solve i want 100 birds on 100 rs.
5
votes
1answer
444 views
Solve this puzzle. I created for my friend for FUN :)
My friend is very good at puzzles. so i thought of creating one by myself and try to see if he can solve. Finally I succeeded and he gave up.
Interested people can try.
Hint: use all four arithmetic ...
1
vote
1answer
229 views
14
votes
11answers
18k views
Find out the correct number
Find out the correct number to replace the question mark.
Source: Beijing Aidi International School summer test (2018-08-21). Author: 坦途国际教育
2
votes
1answer
91 views
What is the expected result? [duplicate]
I found the following puzzle through social media websites,
What is the expected result?
It seems to be easy. But, it needs concentration.
2
votes
6answers
251 views
A Maximising Puzzle Gift for my Girlfriend and I's 28th month Anniversary
The 28th of december 2018 will exactly be the 28th month since I date my fabulous girlfriend, by this time she'll be 18 years old. Here's a puzzle I'll give her this day :
Classical part
Maximize $...
3
votes
2answers
750 views
make this sum using only +
A bit of a speed question this, first correct answer gets the check. Although you are allowed to use computers, it might be quicker not to.
By placing only $+$ signs between some of the numbers on the ...
4
votes
2answers
739 views
Use 2, 0, 1 and 8 to make 71
Use all and only the digits $2,0,1,8$ once each to make the number $71$.
Allowed operations; anything not on this list is banned:
$+,-,\times,\div, ()$ (parentheses and/or choose function)
...
14
votes
6answers
2k views
Use 2 0 1 and 8 to make 67
Use $2$ $0$ $1 $ and $8$ to make the number $67$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 8 can be used.
You can make multi-digit numbers out of the numbers. Examples: 20, 82, ...
6
votes
8answers
510 views
Make $1,\dots,15$ using $3, 9, 9, 9$
This was inspired by many puzzles that use three/four numbers to create other numbers. I chose these numbers in particular because of this post.
Can you find a way to make all the natural numbers ...
2
votes
2answers
150 views
Use math symbols to produce 6 [duplicate]
How can we get (6) from these numbers?
$2$ $2$ $2 = 6$
$3$ $3$ $3 = 6$
$4$ $4$ $4 = 6$
$5$ $5$ $5 = 6$
$6$ $6$ $6 = 6$
$7$ $7$ $7 = 6$
$8$ $8$ $8 = 6$
$9$ $9$ $9 = 6$
$12$ $12$...
0
votes
3answers
462 views
Simple Math Problem #3
Previous Puzzles(Not linked to this one): Simple Math Problem #1 and Simple Math Problem #2
Prove the equation:
$-6439832+ = 9$
$-$ and $+$ are there just to tell that you can use only these two ...
4
votes
5answers
2k views
What is her real age? [closed]
He : What is your age?
She : 35 years old, ignoring the intervening Saturdays and Sundays.
What is her real age?
4
votes
2answers
961 views
Find the missing number (triangle)
Find the missing number (triangle)
Options:
9
8
7
10
Please write the logic also.
3
votes
2answers
74 views
Puzzle #2: Prosecutor's Pathway
This one prosecutor has a very busy schedule. However, although his business can get busy, he is a lawyer faithful to his job, which is why he spends some weekend time at his private law firm.
Since ...
2
votes
3answers
83 views
Puzzle #1: Love In the Air
A couple that were just engaged decided to have their wedding in a hot air balloon. The biggest problem that the couple has is how many guests that they can invite.
There are three different types of ...
8
votes
6answers
666 views
Pizzle - Will you ever show up, Rick?
NB: Pizzle = Puzzle + Riddle
Chapter 1: Let's start (solved in comments)
You can see me, but you can not catch me
I'm lightweight, but I could lift you up easily
Chapter 2: The First Piece (...
1
vote
2answers
321 views
A Secret Math Society
I was about to try to join the famous Math club at my school when I stopped to hear my classmates doing the same. I didn't know that newcomers had to take a simple test to be qualified until my they ...
5
votes
1answer
173 views
Another pattern puzzle with a twist…well, not quite so
What are the next two terms of the following crazy sequence:
I, h, 6, 9l, 52, 9E, 6h, __, __
?
4
votes
1answer
247 views
The wine paradoxon
You're a fellow salesman who happens to have to sell a barrel full of wine. The barrel has a capacity of 5 Litres.
Unfortunately, your apprentice is a wine lover and steals some wine each night, ...
0
votes
1answer
107 views
double the stone puzzle
Story:
I've x number of stones. On my way, I will cross three wells. When I reach a well, then I will throw y number of stones ...
5
votes
1answer
251 views
How to choose the next board in the 8-puzzle?
I hope to have your help to solve the problem I am facing. I'm trying to make an 8-puzzle solver but I'm in doubt about how to select the next board, from the one they have already given me. Below I ...
4
votes
1answer
297 views
M professors and N dishes
Suppose 'M' number of professors have to guess 'N' number of dishes on a roulette menu offered by a restaurant. This restaurant has a special "roulette menu" with N items, in which you choose a menu ...
