Mind Puzzles #8
January 6th, 2007 by natalie
A phonograph record is 12 inches in diameter. The diameter of the unused portion in the center is 3½ inches and the smooth outer band is ¼-inch wide. The grooves containing the music are spaced 30 to the inch. How many inches does the needle move as you play the record from beginning to end?
4″.
Great job, Meg! Looks like you win the prize!