What goes up but never comes down?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

I have feet, but no legs. Which animal Am I?

Which is heavier: a ton of bricks or a ton of feathers?

What is the next number in this matchsticks series riddle?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

How many sides does a circle have?

My location can be determined by the below rebus.
So where am i ?