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?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

You need to remove two matchsticks to make the below equation true. Can you do it ?

What number do you get when you multiply all of the numbers on a telephone's number pad?

The more you take me, the more you leave me behind.
Who Am I?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

John leaves home and then he takes three right turns. John wants to return to home but he was scared of Jacob, who is wearing a mask.

What is John Situation ?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?