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Puzzle 7) Krishna and his savings



Submitted by Amit Shukla, on August 05, 2017

Puzzle

A boy named Krishna lives in Indore in hostel. Krishna’s father gives him pocket money in every 3 months. One day Krishna thinks that he should starts saving his pocket money and he decides to start saving his money for future. On 1st January 2017, Krishna saved 1Rs. Everyday starting from 2nd January 2017, he saved1Rs more than previous day. Now you have to find out the first date at which the amount saved by Krishna will be a perfect square?


Important points of puzzle:

  1. Krishna’s father gives him pocket money in every 3 months.
  2. Krishna starts saving his money.
  3. On 1st January 2017 Krishna saved 1Rs.
  4. Everyday starting from 2nd January 2017 he saved 1Rs more than previous day.
  5. Find the first day in which saving amount is a perfect square?

Answer

8th January 2017.


Reason

On first day Krishna saves 1Rs and after each day he saves 1Rs more than previous day. Hence after 8 days saving became 36Rs which is a perfect square. So, the answer is 8th January 2017.






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