What is always in front of you but can’t be seen?

Find the last number in the series below:

voN luJ yaM raM ---

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

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

What kind of band never plays music?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

By using 'because' continuously three times, can you make an English statement ?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?