Puzzle 7) Krishna and his savings

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 1^st January 2017, Krishna saved 1Rs. Everyday starting from 2^nd 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 1^st 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

8^th 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.