81 x 9 = 801. What must you do to make the this equation true?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What is the riddle which can be asked all day with a different correct answer each time.

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?