I am quite hot but become too cold if you remove the first two letters. What am I?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Count the number of lines in the image below ?

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

Can you count the number of matches in the picture below ?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

You need to arrange three 7 and mathematical symbols to form number 1?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.