People make me, save me, change me, raise me. What am I?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

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

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

Can you decipher the below rebus?

PBLUESAISNUERSES

How can a man go eight days without sleep?

I look at you, you look at me, I raise my right, you raise your left. What am I?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.