deutsch fahrrad marke Riddles

One snowy night, Detective Anderson was in his house reading a book. All of a sudden a stone came crashing through his window, breaking it. Anderson got up and looked out the window just in time to see three neighborhood brats who were brothers run around a corner. Their names were Alan Jones, Mark Jones and Peter Jones. Not knowing of Anderson's reputation as a genius detective, the two innocent brats teased him by sent a note with clue on Anderson's front door. The note reads "? Jones. He broke your window." Which one of the three Jones brothers should Anderson question about the incident?

A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?

Used to threaten, used to defeat. Sometimes it grows, sometimes it shrinks. Used to conquer, used to protect. It marks your downfall, it marks your success. The true god of war, the creator of mess. What is it?

Dark with white markings, And smooth like a rock. Where learning occurs, I help convey thought. What am I?