How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Spot 5 differences in two Christmas tree below:

Prove that the below maths equation is true.

8 + 8 = 91

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

A man is walking down a road with a basket of eggs. As he
is walking he meets someone who buys one-half of his eggs
plus one-half of an egg.
He walks a little further and meets another person who buys
one-half of his eggs plus one-half of an egg.
After proceeding further he meets another person who buys
one-half of his eggs plus one half an egg. At this point, he
has sold all of his eggs, and he never broke an egg.
How many eggs did the man have to start with?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Solve the mathematical equation in the picture below.

The dirtier I get, the whiter I look. Who am I?