Why do we preferably have round manhole covers and not square ones?

I am an odd number. Take away a letter and I become even. What number am I?

What is the word or phrase?

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?

Can you find out the missing number in the grid?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?

Why do people go to bed?

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