How many times can you subtract the number two from the number fifty?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

How can you take 2 from 5 and leave 4?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If an electric train is travelling south, then which way is the smoke going?

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.

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?