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

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Who is that with a neck and no head, two arms and no hands? What is it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

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

In the picture given below, can you find out which digit will take place of the question mark?

What is the next number?

77, 49, 36, 18 ?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?