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?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

John was drowned by he was not wet. How?

Can you count the number of triangles in the picture below?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

Can you find out the remainder when 3^300 is divided by 5?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Find the value of "?" in the ball picture Riddle below: