I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you count the number of squares in the figure below?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

What is the longest word in the dictionary?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?