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?

How many times in a given day, minutes and hour clock comes in a straight line ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Can you place three balls such that the equation shown in the picture holds true?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Can you find out which number multiplied by itself will give the output as 12345678987654321?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?