What goes up but never comes down?

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

Can you count the number of blocks in the picture below?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Which digit occurred maximum times between the number 1 and 1000?

What number do you get when you multiply all of the numbers on a telephone's number pad?

What does this rebus means ?

PROG WORKRESS

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

How can you make number one disappear by adding something to it?