What has one letter and starts with an E?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

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.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

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

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?