What is the next number in the series?

15 29 56 108 208 ?

I travel all around the world but always stay in the corner. What am I?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Count the number of balls in picture below:

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

What does this mathematical rebus means ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What does the below rebus riddle means?