During which month do people sleep the least?

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 ?

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 live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What is more useful when it is broken?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?