Solution:

Smiles (there is a mile between the two S's)

Solution:

Draw a tilted line on 1st plus (+) operator, + will become 4 :-)
The equation then becomes true: 545+5=550.

Solution:

888+88+8+8+8=1000

Solution:

SIX - 9 (IX) = S
9 (IX) - 10 (X) = I
40 (XL) - 50 (L) = X

=> SIX

Solution:

FIVE

Which is : F(IV)E

Where IV = 4

So we achieved 4(IV) inside 5 (FIVE)

Solution:

24 Years

If you were 8 years old 8 years ago, then your current age is 8 + 8 = 16 years old.
After 8 more years pass, your age will be 16 + 8 = 24 years old.

So, you will be 24 years old in 8 years from now.

Solution:

A SINGLE WORD.

Solution:

11

You already knew the answer wasn't 26 letters. That would be too easy.
The letters in the words "the alphabet are 11

Solution:

3

Explanation:
If I had 4 eggs -- Its just imagination.
A thief gives me 3 -- I go three eggs.
My farm rooster lays 5 eggs -- A Rooster can't lay eggs.

Solution:

There are 7 people.