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

If 21x = 79x, what is the value of x?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

Below rebus represent famous DiCaprio movie. Can you name it?