Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

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

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209