They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.

But do you know how many of these numbers are prime?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?