I am white when I am dirty, and black when I am clean. What am I?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

What am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

What does this below rebus puzzle mean?

What demands an answer, but asks no questions

If six children and two dogs were under an umbrella, how come none of them got wet?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Decode this picture on T-Shirt and tell what it says ?