Before Mount Everest was discovered, what was the highest mountain in the world?

What jumps when it walks and sits when it stands?

I am white when I am dirty, and black when I am clean. What am I?

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

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

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.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?