Birthday gift mathematical puzzle
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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
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