Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

Can you find the mistake in the below statement?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?

What month of the year has 28 days?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?