Birthday gift mathematical puzzle
1,395.9K Views
Answered
For my anniversary, I decided to surprise my wife. Since she is a voracious reader, I decided to collect a lot of books for her. On the first day of the month, I bought one book, on the second, I bought two and on the third, I bought three. This process went on till the anniversary and on the day, I had 276 books with me to gift her.
Can you calculate, on which day is our anniversary?
Best answer
n(n+1)/2=276
n2+n-552=0
n2+24n-23n-552=0
(n+24)(n-23)=0
n=23
the date is 23rd
Your Answer
More puzzles to try-
One have five riddle
This is what you use to write But it is not a pen One of these has five fingers And ...Read More »Which room is safest puzzle
A murderer is condemned to death. He has to choose between three rooms. The first is full of raging fires, ...Read More »Joy and Sorrow
He can bring you joy, sorrow, or everything in between. None have seen, smelt or felt him, yet many still ...Read More »Who is the Doctor
A father and son were in a car accident where the father was killed. The ambulance brought the son to ...Read More »Poisonous Pill Puzzle
An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was ...Read More »What am i?
What goes in the water black and comes out red?Read More »What does the below mathematical rebus means ?
What does the below mathematical rebus means ?Read More »Find the Houses
A small town is visited by an ice-cream truck every day. On the first day of February, the truck visits ...Read More »Which flower has two lips?
Which flower has two lips?Read More »How many apples are on the ground?
An apple tree has apples on it. A storm comes through and there is no longer apples on the tree. ...Read More »Quarter between the quarters riddle
If you have two quarters on a table touching each other, how can you move one of the quarters without ...Read More »Can you tell who is wearing what color shirt?
At a restaurant in town, Mr. Red, Mr. Blue, and Mr. White meet for lunch. Under their coats they are ...Read More »Animals in Friend Room
You enter your friend’s room. He is not in his room. Although you see that on the bed there are ...Read More »Why not?
A bus driver was heading down a street in Delhi. He went right past a stop sign without stopping, he ...Read More »School investigation case brain teaser
At the beginning of the first day of school there was a dead boy found inside of a classroom. They ...Read More »Puzzelfry Quiz for the Brilliant-mind
Here’s another short Puzzlefry quiz for the puzzlefry enthusiasts. This one’s a bit tougher . Note that some of the questions are United ...Read More »Count The Triangles
Can you count the number of triangles in the given picture?Read More »Movie Name
Guess the movie name with the help of the characters in the movie separately. 1. Teja, Gogo, Robert – 2. ...Read More »Used by everybody
It is taken from a mine, and shut up in a wooden case, from which it is never released, and ...Read More »Spends on Employees
A generous owner of a company decided to give a bonus of $45 to every man and $60 to every ...Read More »
Accenture Interview PuzzlesAdobe Interview PuzzlesAge RiddleAkbar Birbal PuzzlesAlgorithm PuzzlesAlphabet riddleAmazon Interview PuzzlesAnalytical MathematicsAptitude PuzzleBank PuzzlesBetting PuzzlesBrain TeasersCalendar PuzzlesCards PuzzlesChess Board PuzzleChess PuzzlesChristmas Puzzlecipher PuzzleCivil Services PuzzleClock time puzzleCognizant Interview PuzzlesCoins PuzzleComputational PuzzleconundrumCoronavirus PuzzleCoupondunia Interview PuzzleCritical Thinking Puzzledata analyticsData Structure Interview QuestionsDecode PuzzleDetective PuzzlesDice PuzzleDictionary Riddlesdifficult riddleEasy Math puzzlesEasy puzzlesEinstein puzzleEnglish RiddleFamily Tree Puzzlefamous puzzleFill in the blanks riddlesFinding Killer RiddlesFlipkart interview puzzlesFunny RiddlesGeneral KnowledgeGeographical PuzzleGoogle Code Jam 2014Google Interview PuzzlesGRE PuzzleHard Puzzle