Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

How can you take 2 from 5 and leave 4?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

What jumps when it walks and sits when it stands?

When it is alive we sing, when it is dead we clap our hands. What is it?

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