Find the faulty machine

818.1K Views

A factory manufacturing flywheels for racing cars has ten machines to make them. The manufacturer knows the correct weight for a flywheel.
However, one day one of the machines begins to pro-duce faulty parts—either overweight or underweight.
How can the manufacturer find the faulty machine in only two weighings?

Share
JamesBond Guru Asked on 26th July 2015 in Interview Puzzles.
Add Comment

  • 1 Answer(s)

    The manufacturer must take one flywheel made by each machine, find their total weight and compare this with the weight of the equivalent number of good flywheels to obtain the difference. Then he must take 1 flywheel from machine number one, 2 flywheels from machine number two and so forth, and weigh these against the correct weight for that number of parts

    John123 Expert Answered on 26th July 2015.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.
  • More puzzles to try-