In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

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

Explain?

If a wheel has 54 spokes, how many spaces are there between the spokes?

What is the riddle which can be asked all day with a different correct answer each time.

I am the fastest animal but cannot climb the tree. What am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What word begins and ends with an E, but has only one letter?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?