What work can one never finish?

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.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

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

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

I cannot talk, but I always reply when spoken to. What am I?