Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

How do you go from 98 to 720 using just one letter?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Which five letter word can be added at the end of below word to form a
valid word?

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Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?