Our product and our sum always give the same answer. Who are we?

If 1+9+8=1, what is 2+8+9?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

Replace the question mark with the correct number below.

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Move four matchsticks to the below square to form three squares?