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

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

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

Forwards I am heavy, backward I am not. What am I?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Can you solve below mathematical equation?

2^1234 - 2^1233

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

Replace the question mark with the number below given a simple math problem.