What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

The more of this there is, the less you see. What is it?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Why do you find that most of the buildings are deprived of the 13th floor?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?