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

Can you count the number of quadrilaterals in the picture below?

Can you identify the Oscar-winning movie from the rebus below?

When 99 is considered higher than 100?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Which country gets ill every time?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

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?

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