What can you see in the middle of March and April that you can never see in any other month?

What has one letter and starts with an E?

Buy me, smell me or deliver me, I do not change.

Who am I?

What has many teeth, but cannot bite?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Can you find out the number of the parking space in which the car is parked?

Through your logical capabilities, can you make 7 an even?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?