There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

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?

Who has married many women but was never married?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

You see me once in June, twice in November, and not at all in May. What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I am white when I am dirty, and black when I am clean. What am I?

Count the number of squares in the picture below.

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?