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.

What is the fastest way to double your money?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Can you find the mistake in the below statement?

Can you write down eight eights so that they add up to one thousand?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.