I shave every day, but my beard stays the same. What am I?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Replace the question mark with the correct number in the below-given picture?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

What goes up but never comes down?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

What has 88 keys?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?