It is always ahead of me yet I can never see it. What is it?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

I can write cow in 13 letters.

Can You?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What has lots of eyes, but can’t see?

What can you hold in your right hand, but never in your left hand?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?