A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Using eight eights and addition only, can you make 1000?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you count the number of triangles inside a triangle?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?