# Logic Puzzle for Ancient Ruler

Logic Puzzle using a ruler with numbers missing

An ancient ruler is 9 inches long.

The only marks left are at 1 inch, 2 inches, 9 inches, and one other mark.

It is possible to draw line segments of a whole number from 1 inch to 9 inches without moving the ruler.

What inch number is on the other mark?

### Comments for Logic Puzzle for Ancient Ruler

 Jan 23, 2013 Logic Puzzle by: Staff Answer The inch number for the other mark is 6. The whole number of inches for 1” to 9” can be determined as follows, without moving the ruler: 1” (already marked on the ancient ruler) 2” (already marked on the ancient ruler) 3” (the distance between 9 inches and 6 inches) 4” (the distance between 6 inches and 2 inches) 5” (the distance between 6 inches and 1 inch) 6” (the other mark) 7” (the distance between 9 inches and 2 inches) 8” (the distance between 9 inches and 1 inch) 9” (already marked on the ancient ruler) This is illustrated in the diagrams shown below: Thanks for writing. Staff www.solving-math-problems.com

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