What work can one never finish?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

You need to move three matchsticks to form three squares. Can you do it?

Move four matchsticks to the below square to form three squares?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you Find and name the hidden bird in the picture below ?

Find the Goldfish below the given Image.

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?