What two things can you never eat for breakfast?

I make two people out of one. What am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What number comes next in the series?

5 15 5 18 5 24 14 20 _

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

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?

What jumps when it walks and sits when it stands?